The red and blue on a GMT is meant to indicate daytime/nighttime hours (which is why bicolour 12 hour bezels are nonsense), but you also see bicolour bezel schemes on divers watches to indicate the first 15 or 20 minutes of the scale. Seiko use that a lot and have done for decades, most recently on their PADI special editions.
If you don't mind a divers watch on the sturdier side of things, I really like this model:
The red and blue on a GMT is meant to indicate daytime/nighttime hours (which is why bicolour 12 hour bezels are nonsense), but you also see bicolour bezel schemes on divers watches to indicate the first 15 or 20 minutes of the scale. Seiko use that a lot and have done for decades, most recently on their PADI special editions.
If you don't mind a divers watch on the sturdier side of things, I really like this model:
https://www.watchnation.com/product/seiko-padi-1968-recreation/
But if you're after a 40mm watch it'll be too big.