and add little red flag over your alt, so other will gladly hunt you and kill you
I am against this, stuff like this should be used on separate server, to not mix with the normal players.
And what problem? I can't understand.If you can be higher than 21st level, you have a risk to die permanently.
Everyone would have a reason to keep playing their main character, because he would still get the HP bonus, even the perks.
If one see a guy with 500 HP, everyone go "It's an IronMan, he can be permakilled, GET HIM!!!"