I think this is a great idea! I don’t have a super succinct solution to this, but can collect some preliminary fragments here…
This post tells how to adjust the rate of the metronome / clock:
This post contains a suggestion that shares some overlap with yours:
And this very recent patch has successfully implemented shift+knob functionality, which makes me suspect that a shift+knob clock divider function is probably very possible! - Red Ranger | Patchstorage