I'm sure that something would be extremely painful. Some sort-of-independent tribe/people that uses one or two letters that are "really part" of another languag

I'm sure that something would be extremely painful. Some sort-of-independent tribe/people that uses one or two letters that are "really part" of another language. In short, politics. To the best of my knowledge, Cyrillic languages don't use the Roman script (except where letters appear to be similar). The ASCII subset of codepage 866 is for "cd C:\", not for Cyrillic.