That is awesome. I was looking for something like that. I have a couple of keyboards that I'd love to use with my computers. Do you know if it works fine with A4000 and A2000 keyboards?
Also, it would be great if you could add some info at the github about how to connect the keyboard on Teensy. Also, because I am not familiar with Teensy, are there different versions or revision which we should avoid? It would be nice if you could propose a specific one as a reference.
And finally, I don't know if you plan to do it, I would like to see on github some more info in case someone program teensy and what they could change to program keys differently.
Do you plan to implement and sell a whole product around that? If yes, I would be interested.