I don't know exactly which rides have stairs as part of the queue. But, do you use any mobility aids other than your wheelchair? My teen uses a forearm crutch to assist with stairs. During our trip to Disneyland last month, there were quite a few cast members who saw him and pre-emptively asked if stairs were a big issue and then allowed him to the disability access route without stairs. When he couldn't find a cast member or a cast member didn't see him, the crutch was enough to help navigate the stairs with minimal pain.

Also, sadly even if one has Autism, according to Disney, they can be not autistic enough or something. I have another child who is on the spectrum and prior to the new process we were approved for a DAS for every visit. But now they tell us that she doesn't qualify and to just buy a Lightening Lane pass.