I am a rat breeder who also owns snakes. Not all rat breeders are snobby, many of us own reptiles ourselves. Most ethical rat breeders don't breed their own feeders, but some do. The breeders that do, keep their feeder line completely separate from their feeder lines. If you do that, I don't see most rat breeders having much of an issue with that. Not to say all will be accepting, but most will.

Also, there are lots of "high white" (which is a misleading term) genetics in rats that are completely safe. Such as Variegated (which can produce Masked, Patched, BEW, Odd Eye, etc.), Recessive Blaze lines, Roans, etc.

There are a few Rat Genetic groups on Facebook that I moderate/know the admins. Most are accepting if your questions are on-topic and you don't discuss the feeding aspect.