Hey Phil,
The way to handle "Any CPU" is to modify the TurboActivate.cs file to handle this. So copy and paste the internal "Native" class, and name the copied version "Native64". In the "Naitve64" copy you can delete the "ACTIVATE_OPTIONS", "GenuineFlags", and "GENUINE_OPTIONS" because those will be the same whether you're using the 32-bit or 64-bit versions of TurboActivate.
Then modify the function definition of every static extern in Native64. For instance change the dll name from TurboActivate.dll to "TurboActivate64.dll".
The last step is to modify the actual function calls so the correct DLL is called based on whether your plugin is running in a 64-bit process or a 32-bit process. For example, the top of Activate will look like this:
public static void Activate(){ switch (IntPtr.Size == 8 ? Native64.Activate() : Native.Activate()) { case 2: // ...If you want to wait until the end of the day I'll put together a version of TurboActivate.cs with all the changes made already.