[App_rpt-users] Alternatives to cm108/prefab boxes for PTT/COR?

I'll be honest, I have run out of CM108 fobs to modify, and almost all the new ones are epoxy covered. I'd like to put my node back up, but I want a solution that allows me to use a standard USB audio fob for audio in/out and then another fob - probably serial - for PTT and COR. Last I checked (year or two ago), there was no easy answer to this. I hacked and beat on it, didn't get anywhere Have we made any breakthroughs in PTT/COR via serial lately? Thanks in advance!