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A few options: Some people mount trackballs in their ergo dox. Some keyboards like the keyboard.io include mouse movement keys. You can also find desktop keyboards that include a track point. No ergonomic ones as far as I can tell.

That would be great. I'm also envisioning something embedded in headphones that would move the mouse as you tilted your head

This one seems to turn into a mouse:

"even turns the WASD keys into a high-precision mouse"