Here’s example:

copy – Normal
сору – Cyrillic

Well, no difference, but take a look a bit better… It isn’t the same thing as you’ve expected to be.

цопѕ – The actual Cyrillic of word copy if it’s roughly converted letter to letter. Not translated, just an example.

Problem with this is that I’m not sure how that would be properly filtered, as there are many combinations, including decorated words like this: ĈѺ尸丫

Not sure does it help at all… What I’ve just explained probably caused bigger problem.