do you think any regular controls would work in the mean time?
I guess you could use a regular PC analog stick. Just calibrate it wrong.
Lemme 'splain: Pretend you're simulating a spring-loaded "flicker" stick that you pull back towards you and then let it go. When you calibrate your PC stick, and the calibration utility asks you to center the stick, you hold it
halfway between center and full down. When it asks for the upper left, you hold it all the way to the left, but at
dead center height. Upper right = all the way right at dead center height. Lower left = lower left, and lower right = lower right. Now the software believes your stick only moves from the bottom up to the centerline. This way, when you pull the stick back, and let it go, the springs in the stick pull it back to center, only the software reads center as the top of it's arc of travel. The springs aren't as strong as in the flicker sticks, but it's as close as you're probably going to get. I suppose you could remove the the PC stick's outer handle, and modify the inner shaft to be about the same height as the original flicker stick. That would put a lot less weight against the springs, might make it feel a little closer.
I've never done this, but it seems like it ought to work. If you try it, let us know how it comes out for you!