[TabiFolk]

I think this project will take some time!

Didn’t find anything in Tunisia (though might be good to try in French) but when asking around, someone suggested London Cab Egypt in Egypt:

https://www.londoncabegypt.com/#/home

They said the design can accept a wheelchair user and the FAQ backs this up, but it may just be referring to a hospital like wheelchair.  I’d suggest getting in touch and telling them about your wheelchair size/weight before booking.

Also, the person who told me about them said it was a bit expensive to use for touring since it is a taxi company…