diff --git a/Source/Android/jni/MainAndroid.cpp b/Source/Android/jni/MainAndroid.cpp
index b6468ed85c..988af2a885 100644
--- a/Source/Android/jni/MainAndroid.cpp
+++ b/Source/Android/jni/MainAndroid.cpp
@@ -193,6 +193,14 @@ void Host_YieldToUI()
 {
 }
 
+void Host_UpdateWiimoteExtension(int, int)
+{
+}
+
+void Host_UpdateWiimoteMotionPlus(int, bool)
+{
+}
+
 void Host_TitleChanged()
 {
   s_game_metadata_is_valid = true;
diff --git a/Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp b/Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp
index 2c510fb394..67dee9216d 100644
--- a/Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp
+++ b/Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp
@@ -604,7 +604,7 @@ ExtensionNumber Wiimote::GetActiveExtensionNumber() const
 
 bool Wiimote::IsMotionPlusAttached() const
 {
-  return m_is_motion_plus_attached;
+  return m_motion_plus_setting.GetValue();
 }
 
 }  // namespace WiimoteEmu
diff --git a/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.cpp b/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.cpp
index a93ad379e8..44205a04e1 100644
--- a/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.cpp
+++ b/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.cpp
@@ -22,6 +22,7 @@
 #include "Core/Config/MainSettings.h"
 #include "Core/Core.h"
 #include "Core/HW/Wiimote.h"
+#include "Core/Host.h"
 #include "Core/Movie.h"
 #include "Core/System.h"
 
@@ -269,7 +270,7 @@ Wiimote::Wiimote(const unsigned int index) : m_index(index), m_bt_device_index(i
   m_hotkeys->AddInput(_trans("Upright Hold"), false);
 
   // Extension
-  groups.emplace_back(m_attachments = new ControllerEmu::Attachments(_trans("Extension")));
+  groups.emplace_back(m_attachments = new ControllerEmu::Attachments(_trans("Extension"), index));
   m_attachments->AddAttachment(std::make_unique<WiimoteEmu::None>());
   m_attachments->AddAttachment(std::make_unique<WiimoteEmu::Nunchuk>());
   m_attachments->AddAttachment(std::make_unique<WiimoteEmu::Classic>());
@@ -282,6 +283,8 @@ Wiimote::Wiimote(const unsigned int index) : m_index(index), m_bt_device_index(i
   m_attachments->AddAttachment(std::make_unique<WiimoteEmu::Shinkansen>());
 
   m_attachments->AddSetting(&m_motion_plus_setting, {_trans("Attach MotionPlus")}, true);
+  m_motion_plus_setting.AddCallback(
+      [index](const bool attached) { Host_UpdateWiimoteMotionPlus(index, attached); });
 
   // Rumble
   groups.emplace_back(m_rumble = new ControllerEmu::ControlGroup(_trans("Rumble")));
diff --git a/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.h b/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.h
index e364ccdb6c..883d733633 100644
--- a/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.h
+++ b/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.h
@@ -308,7 +308,7 @@ private:
   ControllerEmu::SettingValue<bool> m_sideways_setting;
   ControllerEmu::SettingValue<bool> m_upright_setting;
   ControllerEmu::SettingValue<double> m_battery_setting;
-  ControllerEmu::SettingValue<bool> m_motion_plus_setting;
+  ControllerEmu::SubscribableSettingValue<bool> m_motion_plus_setting;
   ControllerEmu::SettingValue<double> m_fov_x_setting;
   ControllerEmu::SettingValue<double> m_fov_y_setting;
 
diff --git a/Source/Core/Core/Host.h b/Source/Core/Core/Host.h
index 5fc1fc1ee9..f4037f10bd 100644
--- a/Source/Core/Core/Host.h
+++ b/Source/Core/Core/Host.h
@@ -66,6 +66,8 @@ void Host_JitProfileDataWiped();
 void Host_UpdateMainFrame();
 void Host_UpdateTitle(const std::string& title);
 void Host_YieldToUI();
+void Host_UpdateWiimoteExtension(int controller, int extension);
+void Host_UpdateWiimoteMotionPlus(int controller, bool attached);
 void Host_TitleChanged();
 
 void Host_UpdateDiscordClientID(const std::string& client_id = {});
diff --git a/Source/Core/DolphinNoGUI/MainNoGUI.cpp b/Source/Core/DolphinNoGUI/MainNoGUI.cpp
index 539bbe769f..ced8b25cb2 100644
--- a/Source/Core/DolphinNoGUI/MainNoGUI.cpp
+++ b/Source/Core/DolphinNoGUI/MainNoGUI.cpp
@@ -132,6 +132,14 @@ void Host_YieldToUI()
 {
 }
 
+void Host_UpdateWiimoteExtension(int, int)
+{
+}
+
+void Host_UpdateWiimoteMotionPlus(int, bool)
+{
+}
+
 void Host_TitleChanged()
 {
 #ifdef USE_DISCORD_PRESENCE
diff --git a/Source/Core/DolphinQt/Host.cpp b/Source/Core/DolphinQt/Host.cpp
index a81924cfd8..72a20273e6 100644
--- a/Source/Core/DolphinQt/Host.cpp
+++ b/Source/Core/DolphinQt/Host.cpp
@@ -298,6 +298,22 @@ void Host_RefreshDSPDebuggerWindow()
 {
 }
 
+void Host_UpdateWiimoteExtension(const int controller, const int extension)
+{
+  Settings& settings = Settings::Instance();
+  QueueOnObject(&settings, [&settings, controller, extension] {
+    settings.UpdateWiimoteExtension(controller, extension);
+  });
+}
+
+void Host_UpdateWiimoteMotionPlus(const int controller, const bool attached)
+{
+  Settings& settings = Settings::Instance();
+  QueueOnObject(&settings, [&settings, controller, attached] {
+    settings.UpdateWiimoteMotionPlus(controller, attached);
+  });
+}
+
 void Host_TitleChanged()
 {
 #ifdef USE_DISCORD_PRESENCE
diff --git a/Source/Core/DolphinQt/MainWindow.cpp b/Source/Core/DolphinQt/MainWindow.cpp
index 93ad16a59e..606503e980 100644
--- a/Source/Core/DolphinQt/MainWindow.cpp
+++ b/Source/Core/DolphinQt/MainWindow.cpp
@@ -519,6 +519,15 @@ void MainWindow::CreateComponents()
           &MemoryWidget::SetAddress);
   connect(m_cheats_manager, &CheatsManager::ShowMemory, m_memory_widget, &MemoryWidget::SetAddress);
   connect(m_cheats_manager, &CheatsManager::RequestWatch, request_watch);
+
+  connect(&Settings::Instance(), &Settings::UpdateWiimoteExtension,
+          [this](const int controller_number, const int extension_index) {
+            m_wii_tas_input_windows[controller_number]->UpdateExtension(extension_index);
+          });
+  connect(&Settings::Instance(), &Settings::UpdateWiimoteMotionPlus,
+          [this](const int controller_number, const bool attached) {
+            m_wii_tas_input_windows[controller_number]->UpdateMotionPlus(attached);
+          });
 }
 
 void MainWindow::ConnectMenuBar()
diff --git a/Source/Core/DolphinQt/Settings.h b/Source/Core/DolphinQt/Settings.h
index ad7be608c3..2b2fdde182 100644
--- a/Source/Core/DolphinQt/Settings.h
+++ b/Source/Core/DolphinQt/Settings.h
@@ -224,6 +224,8 @@ signals:
   void USBKeyboardConnectionChanged(bool connected);
   void EnableGfxModsChanged(bool enabled);
   void HardcoreStateChanged();
+  void UpdateWiimoteExtension(int controller_number, int extension_index);
+  void UpdateWiimoteMotionPlus(int controller_number, bool attached);
 
 private:
   Settings();
diff --git a/Source/Core/DolphinQt/TAS/WiiTASInputWindow.cpp b/Source/Core/DolphinQt/TAS/WiiTASInputWindow.cpp
index 08c3431fd8..478d85e54b 100644
--- a/Source/Core/DolphinQt/TAS/WiiTASInputWindow.cpp
+++ b/Source/Core/DolphinQt/TAS/WiiTASInputWindow.cpp
@@ -347,32 +347,6 @@ WiiTASInputWindow::WiiTASInputWindow(QWidget* parent, int num) : TASInputWindow(
   layout->addWidget(m_settings_box);
 
   setLayout(layout);
-
-  if (Core::IsRunning(Core::System::GetInstance()))
-  {
-    m_active_extension = GetWiimote()->GetActiveExtensionNumber();
-    m_is_motion_plus_attached = GetWiimote()->IsMotionPlusAttached();
-  }
-  else
-  {
-    Common::IniFile ini;
-    ini.Load(File::GetUserPath(D_CONFIG_IDX) + "WiimoteNew.ini");
-    const std::string section_name = "Wiimote" + std::to_string(num + 1);
-
-    std::string extension;
-    ini.GetIfExists(section_name, "Extension", &extension);
-
-    if (extension == "Nunchuk")
-      m_active_extension = WiimoteEmu::ExtensionNumber::NUNCHUK;
-    else if (extension == "Classic")
-      m_active_extension = WiimoteEmu::ExtensionNumber::CLASSIC;
-    else
-      m_active_extension = WiimoteEmu::ExtensionNumber::NONE;
-
-    m_is_motion_plus_attached = true;
-    ini.GetIfExists(section_name, "Extension/Attach MotionPlus", &m_is_motion_plus_attached);
-  }
-  UpdateExt();
 }
 
 WiimoteEmu::Wiimote* WiiTASInputWindow::GetWiimote()
@@ -392,7 +366,60 @@ WiimoteEmu::Extension* WiiTASInputWindow::GetExtension()
       GetAttachments()->GetAttachmentList()[m_active_extension].get());
 }
 
-void WiiTASInputWindow::UpdateExt()
+void WiiTASInputWindow::UpdateExtension(const int extension)
+{
+  const auto new_extension = static_cast<WiimoteEmu::ExtensionNumber>(extension);
+  if (new_extension == m_active_extension)
+    return;
+
+  m_active_extension = new_extension;
+
+  UpdateControlVisibility();
+  UpdateInputOverrideFunction();
+}
+
+void WiiTASInputWindow::UpdateMotionPlus(const bool attached)
+{
+  if (attached == m_is_motion_plus_attached)
+    return;
+
+  m_is_motion_plus_attached = attached;
+
+  UpdateControlVisibility();
+}
+
+void WiiTASInputWindow::LoadExtensionAndMotionPlus()
+{
+  if (Core::IsRunning(Core::System::GetInstance()))
+  {
+    m_active_extension = GetWiimote()->GetActiveExtensionNumber();
+    m_is_motion_plus_attached = GetWiimote()->IsMotionPlusAttached();
+  }
+  else
+  {
+    Common::IniFile ini;
+    ini.Load(File::GetUserPath(D_CONFIG_IDX) + "WiimoteNew.ini");
+    const std::string section_name = "Wiimote" + std::to_string(m_num + 1);
+
+    std::string extension;
+    ini.GetIfExists(section_name, "Extension", &extension);
+
+    if (extension == "Nunchuk")
+      m_active_extension = WiimoteEmu::ExtensionNumber::NUNCHUK;
+    else if (extension == "Classic")
+      m_active_extension = WiimoteEmu::ExtensionNumber::CLASSIC;
+    else
+      m_active_extension = WiimoteEmu::ExtensionNumber::NONE;
+
+    m_is_motion_plus_attached = true;
+    ini.GetIfExists(section_name, "Extension/Attach MotionPlus", &m_is_motion_plus_attached);
+  }
+
+  UpdateControlVisibility();
+  UpdateInputOverrideFunction();
+}
+
+void WiiTASInputWindow::UpdateControlVisibility()
 {
   if (m_active_extension == WiimoteEmu::ExtensionNumber::NUNCHUK)
   {
@@ -451,17 +478,31 @@ void WiiTASInputWindow::UpdateExt()
     m_nunchuk_buttons_box->hide();
     m_classic_buttons_box->hide();
   }
+
+  // Without these calls, switching between attachments can result in the Stick/IRWidgets being
+  // surrounded by large amounts of empty space in one dimension.
+  adjustSize();
+  resize(sizeHint());
 }
 
-void WiiTASInputWindow::hideEvent(QHideEvent* event)
+void WiiTASInputWindow::hideEvent(QHideEvent* const event)
 {
   GetWiimote()->ClearInputOverrideFunction();
   GetExtension()->ClearInputOverrideFunction();
+
+  TASInputWindow::hideEvent(event);
 }
 
-void WiiTASInputWindow::showEvent(QShowEvent* event)
+void WiiTASInputWindow::showEvent(QShowEvent* const event)
 {
-  WiimoteEmu::Wiimote* wiimote = GetWiimote();
+  LoadExtensionAndMotionPlus();
+
+  TASInputWindow::showEvent(event);
+}
+
+void WiiTASInputWindow::UpdateInputOverrideFunction()
+{
+  WiimoteEmu::Wiimote* const wiimote = GetWiimote();
 
   if (m_active_extension != WiimoteEmu::ExtensionNumber::CLASSIC)
     wiimote->SetInputOverrideFunction(m_wiimote_overrider.GetInputOverrideFunction());
diff --git a/Source/Core/DolphinQt/TAS/WiiTASInputWindow.h b/Source/Core/DolphinQt/TAS/WiiTASInputWindow.h
index a77c38bb4c..2380afe617 100644
--- a/Source/Core/DolphinQt/TAS/WiiTASInputWindow.h
+++ b/Source/Core/DolphinQt/TAS/WiiTASInputWindow.h
@@ -34,12 +34,17 @@ public:
   void hideEvent(QHideEvent* event) override;
   void showEvent(QShowEvent* event) override;
 
+  void UpdateExtension(int extension);
+  void UpdateMotionPlus(bool attached);
+
 private:
   WiimoteEmu::Wiimote* GetWiimote();
   ControllerEmu::Attachments* GetAttachments();
   WiimoteEmu::Extension* GetExtension();
 
-  void UpdateExt();
+  void LoadExtensionAndMotionPlus();
+  void UpdateControlVisibility();
+  void UpdateInputOverrideFunction();
 
   WiimoteEmu::ExtensionNumber m_active_extension;
   bool m_is_motion_plus_attached;
diff --git a/Source/Core/DolphinTool/ToolHeadlessPlatform.cpp b/Source/Core/DolphinTool/ToolHeadlessPlatform.cpp
index 59495a7d43..c874b1e6c6 100644
--- a/Source/Core/DolphinTool/ToolHeadlessPlatform.cpp
+++ b/Source/Core/DolphinTool/ToolHeadlessPlatform.cpp
@@ -105,6 +105,14 @@ void Host_YieldToUI()
 {
 }
 
+void Host_UpdateWiimoteExtension(int, int)
+{
+}
+
+void Host_UpdateWiimoteMotionPlus(int, bool)
+{
+}
+
 void Host_TitleChanged()
 {
 }
diff --git a/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.cpp b/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.cpp
index 42e1acff5b..991dd0f222 100644
--- a/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.cpp
+++ b/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.cpp
@@ -3,10 +3,15 @@
 
 #include "InputCommon/ControllerEmu/ControlGroup/Attachments.h"
 
+#include "Core/Host.h"
+
 namespace ControllerEmu
 {
-Attachments::Attachments(const std::string& name_) : ControlGroup(name_, GroupType::Attachments)
+Attachments::Attachments(const std::string& name_, const int index)
+    : ControlGroup(name_, GroupType::Attachments)
 {
+  m_selection_value.AddCallback(
+      [index](const int extension) { Host_UpdateWiimoteExtension(index, extension); });
 }
 
 void Attachments::AddAttachment(std::unique_ptr<EmulatedController> att)
diff --git a/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.h b/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.h
index 7553639396..1d0cc95183 100644
--- a/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.h
+++ b/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.h
@@ -21,7 +21,7 @@ namespace ControllerEmu
 class Attachments : public ControlGroup
 {
 public:
-  explicit Attachments(const std::string& name);
+  explicit Attachments(const std::string& name, int index);
 
   void AddAttachment(std::unique_ptr<EmulatedController> att);
 
@@ -33,7 +33,7 @@ public:
   const std::vector<std::unique_ptr<EmulatedController>>& GetAttachmentList() const;
 
 private:
-  SettingValue<int> m_selection_value;
+  SubscribableSettingValue<int> m_selection_value;
   // This is here and not added to the list of numeric_settings because it's serialized differently,
   // by string (to be independent from the enum), and visualized differently in the UI.
   // For the rest, it's treated similarly to other numeric_settings in the group.
diff --git a/Source/Core/InputCommon/ControllerEmu/Setting/NumericSetting.h b/Source/Core/InputCommon/ControllerEmu/Setting/NumericSetting.h
index 863e211cae..87b63f5c1a 100644
--- a/Source/Core/InputCommon/ControllerEmu/Setting/NumericSetting.h
+++ b/Source/Core/InputCommon/ControllerEmu/Setting/NumericSetting.h
@@ -3,7 +3,10 @@
 
 #pragma once
 
+#include <algorithm>
 #include <atomic>
+#include <functional>
+#include <mutex>
 #include <string>
 
 #include "Common/CommonTypes.h"
@@ -173,7 +176,8 @@ class SettingValue
   friend class NumericSetting<T>;
 
 public:
-  ValueType GetValue() const
+  virtual ~SettingValue() = default;
+  virtual ValueType GetValue() const
   {
     // Only update dynamic values when the input gate is enabled.
     // Otherwise settings will all change to 0 when window focus is lost.
@@ -184,9 +188,11 @@ public:
     return m_value;
   }
 
+  ValueType GetCachedValue() const { return m_value; }
+
   bool IsSimpleValue() const { return m_input.GetExpression().empty(); }
 
-  void SetValue(ValueType value)
+  virtual void SetValue(const ValueType value)
   {
     m_value = value;
 
@@ -202,4 +208,76 @@ private:
   mutable InputReference m_input;
 };
 
+template <typename ValueType>
+class SubscribableSettingValue final : public SettingValue<ValueType>
+{
+public:
+  using Base = SettingValue<ValueType>;
+
+  ValueType GetValue() const override
+  {
+    const ValueType cached_value = this->GetCachedValue();
+    if (this->IsSimpleValue())
+      return cached_value;
+
+    const ValueType updated_value = Base::GetValue();
+    if (updated_value != cached_value)
+      TriggerCallbacks();
+
+    return updated_value;
+  }
+
+  void SetValue(const ValueType value) override
+  {
+    if (!this->IsSimpleValue() || (value != this->GetCachedValue()))
+    {
+      Base::SetValue(value);
+      TriggerCallbacks();
+    }
+  }
+
+  struct CallbackID
+  {
+    size_t id;
+
+    bool operator==(const CallbackID&) const = default;
+  };
+
+  using SettingChangedCallback = std::function<void(ValueType)>;
+
+  CallbackID AddCallback(const SettingChangedCallback& callback)
+  {
+    const CallbackID callback_id{.id = m_next_callback_id};
+    ++m_next_callback_id;
+
+    std::lock_guard lock(m_mutex);
+    m_callback_pairs.emplace_back(callback_id, callback);
+
+    return callback_id;
+  }
+
+  void RemoveCallback(const CallbackID& id)
+  {
+    std::lock_guard lock(m_mutex);
+    const auto iter = std::ranges::find(m_callback_pairs, id, &IDCallbackPair::first);
+    if (iter != m_callback_pairs.end())
+      m_callback_pairs.erase(iter);
+  }
+
+  void TriggerCallbacks() const
+  {
+    const ValueType value = Base::GetValue();
+    std::lock_guard lock(m_mutex);
+    for (const auto& pair : m_callback_pairs)
+      pair.second(value);
+  }
+
+private:
+  using IDCallbackPair = std::pair<CallbackID, SettingChangedCallback>;
+  std::vector<IDCallbackPair> m_callback_pairs;
+  size_t m_next_callback_id = 0;
+
+  mutable std::mutex m_mutex;
+};
+
 }  // namespace ControllerEmu
diff --git a/Source/DSPTool/StubHost.cpp b/Source/DSPTool/StubHost.cpp
index eb263d904c..f741f5254a 100644
--- a/Source/DSPTool/StubHost.cpp
+++ b/Source/DSPTool/StubHost.cpp
@@ -75,6 +75,12 @@ bool Host_TASInputHasFocus()
 void Host_YieldToUI()
 {
 }
+void Host_UpdateWiimoteExtension(int, int)
+{
+}
+void Host_UpdateWiimoteMotionPlus(int, bool)
+{
+}
 void Host_TitleChanged()
 {
 }
diff --git a/Source/UnitTests/StubHost.cpp b/Source/UnitTests/StubHost.cpp
index ffbb0c41c2..33a70b08e4 100644
--- a/Source/UnitTests/StubHost.cpp
+++ b/Source/UnitTests/StubHost.cpp
@@ -79,6 +79,12 @@ bool Host_TASInputHasFocus()
 void Host_YieldToUI()
 {
 }
+void Host_UpdateWiimoteExtension(int, int)
+{
+}
+void Host_UpdateWiimoteMotionPlus(int, bool)
+{
+}
 void Host_TitleChanged()
 {
 }