Now I’m wondering whether corporations would use 6-hour shifts (2.5 dec) instead of 8-hour shifts (3.33… dec) when switching to decimal time.

I assumed that lunar months are delimited by full moons, but I was wrong.

mm⁻¹ would be unintuitive since that kind of micro adjustments are uncommon in my opinion.

This is actually a good idea. I have considered “/cm”, “pcm” (per centimeter) and “cpcm” (counts per centimeter), but they don’t look right in my opinion.