It could be done in the database, but we might just get away with the "censoring" of hellgateaus.cyou as well - at least I don't think that's likely to cause any issues...
I made a mistake when looking up the WHOIS information, and will edit my post above accordingly. For now, my approach will be to set up the censoring, and then remove the forum notice that I had placed as an emergency measure.
Regards, NiteHawk