Here's a thought. Let the PC handle the macro. You can use AutoHotKey to remap an incoming bluetooth keystroke to any string you can think of.

The Sofabaton can already emulate most of the functions of a bluetooth keyboard including the multimedia keys. I'm running Kodi on a Beelink tiny PC, and the only thing missing is the multiple keypress... something necessary if you want to launch an application with a shortcut. Once Kodi is running, you have everything you need.