That confusables list is a good starting point, although you'll need to make additions, and probably scale back a couple of the over-zealous ones (eg. rn -> m)

That confusables list is a good starting point, although you'll need to make additions, and probably scale back a couple of the over-zealous ones (eg. rn -> m) I'm coming at this from a comment spam point of view, not usernames, btw.