The Datahand / Svalboard branch is even more niche than a standard mech board. They are really designed for people who are facing injury, injured, or have been injured.

I'd encourage you to look at the Svalboard, I think it solves many of the issues you are running into. In the end, moving a large mouse is not good for someone with shoulder issues, the "Svalmouse" has been tried and solidly rejected. (Using a Svalboard hand as a mouse.)

If you want to discuss things, I'm sure you can find me on the Svalboard discord. :)