Exactly. I had a manager who said "Standup with start exactly on time", and stuck to it. And after a couple of meetings with some people coming in a minute or two late and realizing he was for real... everyone started showing up on time.
this is exactly the way to do it. i have a recurring large meeting where the first 5 minutes is ALWAYS "lets wait for a quorum". Guess what time I show up to the meeting? 5 minutes late, of course.
No need for hacks, just better managers