Keyboard for disabled

I got the idea of ​​a keyboard for people with disabilities. I have friends, they have a disabled son. I do not know what kind of disease, but very common. He cannot coordinate movements, talk. But owns a good computer. In order for him to work comfortably, the keyboard must be with thumbtacks and withstand a punch. In it (or in the software) should be T9 as in the phones or something like that. It is clear that Lebedev will not develop such a clavu until he is convinced of commercial success. But suddenly I will have like-minded people, but most likely it will be like this ... thoughts out loud.