Hi Keith,
I can't help with insurance in the US and I don't know about pricing for repairs.
My guess is that you could replace the PG Drives VR2 Joystick Controller for less than $500, especially if you can find one used. The joystick is used on quite a few electric wheelchairs, so it should not be hard to source one. Keep in mind that you will probably need to reprogram it for the ZX-1 settings, but that should not cost you much from a DME.
Here is a link to the documentation in case you don't have it. I'm not sure if it will be the same version as yours though. http://sunrise.pgdrivestechnology.co...SK77898-05.pdf