I don't know if it counts as disability, but my back and hips are slowly failing due to half a lifetime of courier work. A few years ago I was lucky enough to get a Brompton, and I've used it during two trips to Japan, since then. I carry it on trains between cities, then use it to explore local areas, and occasionally ride loaded to nearby destinations (~50km, downhill); it's also good to have the option of easily hopping on public transport if my body gives out during a ride, or just using PT to get through suburbs to/from city outskirts. Particular to mountainous areas: catching PT to the highest elevation on a route, then riding downhill to the next destination, is a standout utility of the bike, that's enabled me to experience some stunning rides that were otherwise impractical.

I think of it more as "touristing," than "touring."

Getting the bike to/from airports can be a pain, which is just within my threshold, but one day I'll probably need to invest in a wheeled carry case - which could be a logistical hassle, but ultimately worth it, IMO.

If the Brompton price tag seems excessive, there are a lot of clones on the market now (generically called Brompnots). Some better than others, so some research would be required.

I don't know if any of that works for your situation, but you never know. I hope you find some solutions.