I’m not sure I understand why working on a new keyboard OS is keeping the mind busy, but working on new songs or other ‘musical’ aspects is not...

But no problem, everyone finds their own path. 😎

Me, I’d still stick to one song per whatever. The minute you start sharing setups between different songs, you have more to remember if you want slight differences (tempi, mixes, sounds, effects etc.) between them as they evolve.