I've seen some wheel chairs that have attachments or controls built it and on. Is that what you have? If so, is there a place where you could attach a small board with velcro for the pedal to use with your forearm? If not, see if someone can reverse engineer a pedal safely. Maybe a toggle switch for on off, and a dial knob for speed? It would have to use the same plug ends for the machine.
We re-engineered the wiring in my Spitfire. I simply had rows of toggle switches on the dashboard. The law stated everything had to work (it did), the law didn't state HOW. So a good EE might be able to work something for you.
Some colleges are interested in projects for the handicapped. I remember the Air Force Academy demonstrating a sled for the handicapped so they could enjoy skating and hockey. Developed as a research project.
Last edited by Weezy Rider; 08-26-2014 at 04:40 AM.