Thanks all for the info and links. Looks doable. Going to give it a try.
For the sake of keeping all info together for reference here's the post about the conversion on a 944 (pics are gone but info is still there):
https://rennlist.com/forums/944-turbo-and-turbo-s-forum/693963-control-your-stereo-with-your-tiptronic-steering-wheel-buttons.html