This could also be achieved by letting steps in a certain resolution be deactivated (and therefore skipped).
So you could have 3/4 by deactivating steps 7 and 8 as long as they were completely skipped and the sequence moved immediately to the next step.
This would mean if you had one track with all 8 steps and one track with one step deactivated, their overlay would change in every repeating pattern.
If all tracks had the same number of skipped steps you would effectively be in another time signature.
This could be on a per track basis, rather than for each 1-64 […] boxes whatever we call them.