Hi Bruce,
We also have a house that is designed around supporting people with disabilities, but so far our biggest problem is with airbnb itself.
My wife is an Occupational Therapist and has worked in the community with disabled people for 30 years, based on her experience we built a house from scratch with a flexible design around the idea of supporting a familly where one or two of the guests have a disability. So we built in, level step free access, wheelchair ramps in the garden, electric rise and fall worktops in the kitchen, roll in/out shower wetroom and may more features. So far so good.
Our problem is getting it properly listed on airbnb, we have uploaded photographs for the accessibility section twice now, they go up, then they are listed as "pending review" for about a month or two, then they just disappear. This is not just us, if you do a search you will find other hosts who are having the same problem.
What it looks like to me is that whoever is doing the reviews is overwhelmed and is doing a bulk delete every few weeks to keep up with the demand so if you are still in the que your request just disappears.
It seems a shame that you have people who are desperate to find suitable property, and hosts who are making changes to their property to be able to make them more accessible and yet airbnb cant seem to put them together, which is a bit weird as that should be there core bussiness.
Anyway good luck with your place, cheers John.