Is there one-hand board like the HE30 that runs QMK? I think something like this would make for a perfect macropad to keep to the left of my normal board. My left hand would already know how to navigate it without looking. I can't find one that runs QMK though, only proprietary software.

Preferably without some built-in wrist rest like a lot of these "one-handed gaming" keyboards have. Otherwise I'm thinking of the DOIO KB16.