so I've actually changed my mind a bit to fix one of my problems. I will simply change the voice commands to be more "complicated" instead of having a push-to-talk function key. So All I would need is the Volum knob and the basic LCD display for the track info.
I figured I'd go with Phidgets but I don't know which ones or how I'd make them work. (never worked with these before) Any suggestions on which to get? and maybe links on how to use them on a PC? (couldnt find any searching)