I've always wondered why they don't make keyboard halves that attach to arm rests on the typical office chair. So your arms are lowered for more blood flow, and the wrists and elbows in a more natural/neutral position. I'd buy it.

In the meantime, I have a MS "natural" keyboard, and a vertical mouse as well. Those have solved all my RSI/wrist pains.

Going back to flat or compact keyboards and horizontal mice is extremely annoying. Not just the muscle memory gap, but the positioning just feels wrong.