For those interested in such things, I found this interesting thread [1] with lots of brand names to look into, although no easy answers.

Looking at Vollrath's line, their 59300 Mirage Cadet hob at $350 has only 20 power settings, and the 59500P Mirage Pro at $680 has 100 levels (but with not-great reviews...).

[1] https://www.houzz.com/discussions/5590893/induction-cooktops...