Does anyone have or know of research on self-employment for people with disabilities?

You are welcome.

Thanks so much.

I am aware of two studies relevant to your question:
Pagán-Rodríguez, R. (2011). Self-employment and job satisfaction: evidence for older people with disabilities in Europe. European journal of ageing, 8(3), 177.
The study found that self-employed people, both disabled and non-disabled older persons, were more satisfied with their jobs compared to their salary counterparts.

Quinton, M. C. (2014). Self-employment as a solution for attitudinal barriers: A case study. Work, 48(1), 127-130.
This is a case study research: a 53-year-old woman with multiple physical impairments (degenerative rheumatoid arthritis and systemic lupus erythematous) who faced serious attitudinal barriers without opportunity for advancement, secured a loan for a wheelchair-accessible van to start own business. She succeeded and more than doubled her earlier office manager's income.