There are some fantastic grants out there now for parents who want to further their art. I think that it would be really helpful to have something similar for pwd - grants to help carve time to write, or to pay for art supplies/cameras/etc.
It's an enormous struggle to get set in a profitable cycle - because to be able to afford the time to complete the work, and to afford the necessary supplies, you have to work. And having worked, you might be fresh out of spoons to engage in the art.
Right now, the only money out there that I've seen for artists with disabilities are for people who are already well established, or have been working on well-funded projects.