Yes, I cloned the repo and tried build inputs, but the build fails with the same issue the poster in the other thread has, apparently related to seeeduino_xiao_ble boards. Manna_harbour said:

The shield has been updated to use ZMK main now, so the outboard will need updating. For now you can use zmkfirmware/zmk/main with the workflow branches option to override the old value.

But I don’t see how to do this. Master is the only option when I use the build inputs action.

I did try making my own similar layout with vial before, but my new board uses zmk and setting everything up by hand looks very fussy when I could just use an existing firmware that does what I want. … If I can get it to build, anyway.