My interest is that I've just retired from teaching special education. Most recently I taught high school students with mild disabilities, but I have worked with all ages and types of disabilities over my career. Music has always been a sideline that had little connection to my work life, after I gave up the idea of music therapy as a career. But I wonder if anyone has made a serious study of accommodating music instruction and participation for people with disabilities. I suppose someone has, and I just don't know about it.
As people with disabilities know, the rest of us are the "temporarily able-bodied." If we live long enough, we'll all accumulate some disabilities. I would like to know that someone is studying how to circumvent those disabilities and continue a meaningful participation in music (not "rhythm band").
It's not apparent to me how disabilities might impact work in music theory, other than cognitive or auditory disabilites, which would probably preclude an interest in music anyway. But anyway, I'm pleased to know that there's some discussion going on about the intersection of music with disabilities, although my own interest is at the level of idle curiosity. Best of luck to you!