Right.... Well you could look into 100% natural medication??? with no chemicals. Maybe there is a plant that is good for medication.
I would have to research this topic and if I find that info. then I will post the link so you can read it, especially with your situation. Many people who are in a wheelchair get jock itch. You could talk to another guys who are in wheelchairs and see how they solved the problem to stop the jock itch. I am sure they would turn up some better answers than I could be able to help you with that one.
You also can talk to the women who are the nurses in the hospitals who help people that are in wheelchairs. I am sure they can pass on some helpful tips to be able to help you.
Hope that helps, man....