Ask HN: Hands-Free Mouse Control Options

Due to RSI and ulnar nerve irritation I am not able to bend my arms a the elbow for long periods of time. This directly impacts my ability to type and use a mouse throughout the day as one normally would.

I am considering hand-free mouse control options.

Looking around there don't seem to be that many options, so any suggestions in terms of devices, software and their precision and performance would be very helpful.

One crazy-expensive option I'm considering is: https://www.apple.com/shop/product/HNPB2ZM/A/ablenet-trackerpro-2-hands-free-mouse