Ableton Live is a great tool to compose music - tho I am not a fan of the squishy buttons on its interfaces, I don't know how it would work for you with your disability. But with a good DAW you can erase and adjust, and play around with samples, with midi. Maybe a midi keyboard would work for you? A small one like the Akai LPK25 is quite inexpensive and will open a lot of possibilities plugged into Live.

In any case, I wish you fun!