The TM Cougar throttle plugs into the stick base. The TUSBA adapter makes it stand alone and USB compatible.
I used the TUSBA with my Cougar TQS but I was not impressed. Maybe it didn’t like the Hall sensor I had replaced the pot with?
Anyway, using a teensy or arduino, or @gadget’s controllerboards, and converting it to USB wouldn’t be hard to do. You will lose the ability to use TARGET to program the switches.