Just another ping for @berestovskyy for confirmation.
I did an experiment with Motoko playground and it seems that setting. A timer with a Duration of 0 seems to always run the next round. (I confirmed this by setting and appending the Time.now to detect which round I was on). Unfortunately, I forgot to save the playground link🤦♂️.
I did find this threat and wondered if this was implemented if it would change things: System Timer support async* with this still open issue meta: Timer-related cleanups · Issue #3663 · dfinity/motoko · GitHub