I’ve wanted to do this because there’s a zillion cool clocks out there that use a similar movement. I’d also wanted to make it battery powered which means doing NTP update only once per day (or less). Doubt that is realistic, tho.

Maybe embed Hall sensors and detect when the hands are in a certain position and when all three line up wake the ESP32, do an NTP update, tick it forward to where it should be, then go to sleep. Probably still use too much power, especially the Halls.

Use reed switches behind the clock face and magnets on the (presumably) different length hands instead of hall sensors. NTP sync once per day is more than adequate for household timekeeping - it might drift a few seconds here and there, but that’s fine for most people?