I made a
Windows WiThrottle client, and it does work on Windows Phone. I already support different UIs in the app, there's no reason why I couldn't add a "Proto Throttle" looking UI. The problem, of course, is that even Microsoft doesn't support Windows Phone anymore so you'd be stuck tethered to a desktop, or at best a Surface Go which is still an 11" tablet.
Does the Proto Throttle do on board processing? Or does it just transmit speed and function info, and rely on the e.g. momentum settings of the DCC decoder?
Edit: Here's a quick and dirty look at what I've done. It's held together with hopes and dreams and a liberal amount of duct tape, but it kind of gives you an idea where I'm headed. The bell being F1, the bullhorn being F2, and both lights toggling F0... Is there any interest in continuing this project?