I took it as a basis and adapted it to my needs. It’s for my travel keyboard that has to be as portable as possible. For normal work I use another keyboard that has extra keys for the modifiers.

My work keyboard is almost like yours but without the 6th column on each side. Still fine to use if you use a proper key mapping. Mine is https://github.com/manna-harbour/miryoku

They changed their slogan a while ago. Guess why…