Providing a solution for people with disabilities is not a developer's job. If a group need something special because of their disabilities, probably they already have a medical report for that, and a solution recommended by their health institution. The health organization may want to employ me (I would not accept though) and develop a solution for them, this would not be a direct relationship between me and the person with a disability.

Accessibility is concern of a developer, however accessibility is for everyone, not only for the people who have disabilities. People with disabilities may benefit of accessibility features.