You could probably safely modify/eliminate the "trigger" for the Augustus trait, but that would only stop characters from getting it in the future, it would do nothing for the characters who already have it. You could also try modifying the trait text files in order to get rid of the "Avgvstvs" epithet, but that would do nothing to stop the spread of the trait itself. It would only be an aesthetic change to stop it from gobbling up their real name.

A simpler solution, for your AAR, anyway, would probably be to modify your screencaps to show their old name.