Hehehehehe, driving off a cliff isn't good, but it's kinda fun to watch. Might be worth trying to find a mode that lets you throw a switch to lock out the drive channels?
I really don't want to admit how long it took changing keywords and going through image searches trying to find a 1-axis stick pot. I'm *really* not sure how this description is even close, but whatever.
"uxcell 10K Omh 3D Analog Joystick Potentiometers with Knobs Wireless Module Controller Rocker Up & Down Latching for Handheld Game Xbox Orange 4pcs"
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Parts are now in my hand and look right. 4 pack of single axis, War Shu Gai with a Crab Rangoon brand stick-type pots, around $10.