You could do something like Betta unimaculata, patoti, ocellata. They are bigger mouthbrooding species and don't mind a slightly higher pH. Albimarginata and channoides are two smaller mouthbrooding options that I find to be less fussy. You could probably also do captive bred splendens complex stock (imbellis and smaragdina) as well depending on your personal preferences.
The coccina complex is probably the most sensitive out of all the wild bettas species. Only because they really need the soft water to thrive.
But a lot of the other species (particularly captive bred stock) tend to be able to adjust fairly well to slightly less than ideal parameters (a neutral pH is really not that bad as long as your water isn't extremely hard).