It seems that a lifetime of manipulating things that are in front of me has finally resulted in some rotator cuff problems, using a mouse and keyboard is probably mostly to blame.
When using a standard keyboard with good shoulder posture (shoulders back with scapulae retracted and back flat, elbows at sides), the angle of the my wrists makes my forearms fatigued. I have one Alice layout keyboard that slightly alleviates this, but since it's just the layout that's split and not the two sides of the keyboard (i.e., it's still one contiguous piece), it still causes my shoulders to internally rotate a bit or my wrists/forearms to compensate for the lack of shoulder internal rotation.
The options I'm considering are below with thoughts just based on photos. Any feedback would be helpful.
1. Keymouse Chair Track - Paired with the right chair, this may be a good solution. I prefer a thumb trackball when not playing games, so this looks like a good option, but it's out of stock now and it's absolutely insanely expensive for a 3D printed item ($700+). The non-chair version may be preferable though.
2. Mistel BAROCCO MD770 - Reasonable price, familiar layout, ability to convert to normal straight keyboard, some tenting.
3. Ergodox EZ/Moonlander - Price is between the other two, decent tenting, doesn't look stable on the desk though. I didn't know about the Moonlander version until I looked at the website today, so I'm not sure how much that changes.
I think I'm leaning towards the Mistel since it's the most familiar layout and most accessible (cheap[er] and on Amazon). I'm afraid of having to learn some goofy layout, and that hindering the goal of just helping my shoulders.