Feature request: keyboard app

I would like to be able to use my precursor as an external keyboard. Like an "app" similar to the password manager, but for general text input rather than specific strings.

Long ago (before the password manager appeared) I made a proof of concept by modifying shellchat's usb send string function, but lack of time and rust skills got in the way of anything past that.

The basic concept would be a simple one-to-one mapping of the keys, that could later be expanded to any unicode input.

So, if anyone wants to give it a try that would be cool. I can definitely help with testing at the very least. Bonus points if you name it 'Clack' (Customizeable Live-ACtion Keyboard, or something like that, lol).