This won't help anyone who has lost the use of their hands, but I have some advice for touch typists who use a standard keyboard like a laptop or typical desktop keyboard: don't bend your wrists.

Of course most people know about the ergonomic advice to have your keyboard at the right height so your wrists don't have to bend up or down. But I often see people typing with a horizontal bend in their wrists so that their hands are pointing straight forward as they type, like this crude sketch:

      | | |   | | |
      | | |   | | |
      +---+   +---+
      /  /     \  \
     /  /       \  \
    /  /         \  \

If you do that, try this instead: don't bend your wrists to make your hands straight. Relax your wrists and let your hands be at the same angle as your arms:

      / / /   \ \ \
     / / /     \ \ \
    +---+       +---+
    /  /         \  \
   /  /           \  \
  /  /             \  \

Your fingers will still be able to find the keys, but it may take some getting used to if you've been using the "bent wrist" position. Once you get the hang of it, this may reduce the stress on your wrists.

I've been typing on standard keyboards nearly every day for about 50 years without any significant problems. I tried using the "bent wrist" position as a quick experiment and it was really uncomfortable. So while I can't say for sure that it will help everyone, I'm pretty sure the "straight wrist" position has helped me.