This is a very interesting topic, as I don't see a reason why disabled people could not use cryptocurrencies.
Once in a open source meeting (in 2013), I saw a blind man using what I could call a blind display. It was a big matrix of pins that would go up and down to form braille. According to him, it was a very old device, not produced anymore, and he was looking for someone or a company to design a new model. He was also using a braille keyboard, and was doing translation tasks all the time (even when we were both discussing). He was very very fast reading and typing with his strange rig.
So I think there may be creative solutions to bring crypto to blind people, but it must be well thought and built.
Being blind or disable doesn't mean they're not capable to do things what normal people can do.
These people has a great perspective in life, very optimistic and their disability is not the hindrance to try and do something new. Actually, its hard to think that a blind man is into bitcoin but with their eagerness to learn they struve more. Maybe the sources are limited but they can turn it to unlimited. They do this extra ordinary.