I am the person who designed the PCB for the current prototype. It's running the open source ZMK firmware, and that one works flawlessly on Linux. I had a prototype connected to my notebook (T450s, Intel AC9260 wifi chip, Arch Linux) already and did not encounter any issues, and since it's open source and all configs are public, adapting the keymap to your needs and maybe get rid of some mac-specific things wouldn't be a problem.

In fact we are considering a software toggle (e.g. FN + ESC or maybe more complicated to avoid accidentally toggling it) that has a "Win/Linux" and "macOS" mode, but I didn't get around testing that yet.

> but over bluetooth it does something weird so that a hack [1] to use it in Mac mode is necessary and some key combos still don't work right for me.

I have one too and it does it over USB as well. Though keyboard shortcuts work fine for me, USB or not.

I had a similar problem with the Tecurs KB510 I got at work. The only way I found to type F1-F12 keys on Linux was to set up a hack with kbct [0] and the Super key... until I tried the configuration described in the gist you linked. Thanks a lot for that !

[0] https://github.com/samvel1024/kbct