I saw this on the Government Surplus site govliquidation(dot)com:
General Atomics Throttle Assemblies They are mounted on a metal panel which looks perfect for a button box assembly oi the middle and perhaps even a joystick on the right side. From the pics the throttle and two trim controls have linkages and/or attachments to potentiometers already. Depending on the rating of the pots, this could be very close to 'drop in' ready for a simpit if you connected them with a controller board.
They are in Oklahoma City, OK, USA and I really don't know what arrangements could be made for shipping, if any. I'd ask about going in with someone on these but my income taxes this year have taken me by surprise and any excess funds are quite slim. I could pay shipping if anyone wants to give me one as a finders fee.
Anyhoo, I thought this may be of interest to some folks that live near there. (Two days left on the auction)
Regards,
Derek