I wonder if there's a workaround through the Badge System.
But it would depend if there's a way to change the overhead etc. name displayed.
Also, between griefing and KI records if there's ever a need to go into an account to find a lost item or check glitches... not changing the core name - but adding the new name in connection - like a Nick Name. Essentially making that character's name longer KI side sees the whole name original + new name. Game play side we only see the new name.
If people have ignored a player they're invisible, I think. So if the account is the same, and the core name behind the game is the same - they would still be invisible.