I talked to a buddy at lunch today, about using the servo on the knob possibility.The main problem I see there, aside from the bandaid type fix.
I would need to setup some type of index pulse on the motor shaft to track the speed. Then I could write the code to turn the servo based on index pulses.
It has a short/medium/long with a logic control to the potentiometer that replaces the foot control. It works "ok", but will not work with homesteader.