“that are un-assimilatable with western mores.”
The word you might be looking for is “unassimilable” but then what do I know. I come from country where they taught me everything by “route memorization” ......and I am not very “assimilatable”. ;)
For those who don’t engage in rote memorization, a distinction is made between assimilable as where liquids mix and assimilatable in dealing with cultural adaptations. Check issues of Comparative Culture Review, a scholarly publication where the term “assimilatable” appears with some frequency.