@katec
Hi Kate, I saw this discussion and was not previously aware of your son's situation. I am very very sorry to hear that someone so young has been stricken by this awful (understatement) affliction of peripheral neuropathy. This is a bit off of the topic of things which might facilitate his ability to drive. But I did think of a couple of things you might want to look into for your son if you have not already done so.

The first is something that might provide a small benefit in the way of some temporary relief for his burning feet. Linda, my wife, also has PN in her feet, which burn ferociously most of the time. Like many others we have tried quite a few different ideas we have heard about. One thing that has helped her a lot is a product called Penetrex. It is a homeopathic based product. I've recommended it a bunch of times, but here is the post where I first mentioned it (I think): https://connect.mayoclinic.org/discussion/anyone-here-dealing-with-peripheral-neuropathy/?pg=131#comment-395581

The other thing occurred to me when I was reading about how you and he were looking into stimulators, and that he tried a drg. I wondered if you had ever run across the idea of Calmare scrambler therapy? It was first developed by an Italian company and there are now a number of scrambler devices being used in the US. I had done a lot of reading about it 4-5 years ago. Rather than tell you about what it is, I will include a couple of links for you to look at. You can find a fair amount online about it. It apparently has helped some people a lot:
https://www.foundationforpn.org/2016/12/09/scrambler-therapy-for-treating-neuropathic-pain/
https://www.scramblertherapy.org/false-myths.htm
I just thought this might be a good fit as a treatment for your son. Linda can't do it as she can't tolerate the travel; we are in the Nashville area and have not found one here, and she is too weak and pain impaired to go outside our area, but your son, being so young, might not have as much trouble. The devices are located here and there. Maybe there is one in Texas. The treatment itself takes 2 weeks and used to cost about $5000, but not sure how much now. I really feel for your son, and for you as his parent and guardian. What a nightmare! My heart is with you guys! Best, Hank