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You know what I think is worth looking at - the Blancpain Léman flyback chronos from the 2000s.
Eg: https://www.chrono24.co.uk/blancpain/leman-flyback-chronograph-2185f-1130-63-c-2010--id27251782.htm
38mm (there was even a 34mm version), automatic, high quality flyback (obviously) movement with date, was also offered on a bracelet if that's important. There are white dial variants as well.
Speedmaster 38.
But the standard moonwatch carries its proportions well. I have small wrists and doesn’t over power at all.
In fact my daughter also wears a vintage moonwatch and doesn’t look or feel too big on her.
Failing that a speedmaster reduced as suggested here.