Coding it in aside, this would be pretty easy to manually do on a case by case basis in game.
Have someone create a fresh level 1.
Nuke all of the items in their inventory.
#name a_fire_beetle001 (numbers work in pc names just like npc names, they dont display so you could have an army of whatever NPC with the same name)
/be [appropriate syntax for the mob]
#level whatever level
#cast appropriate undispellable gm event buff to tweak stats to match the mob
#setallskill to match the level
Give them a poof-on-death gm event weapon/armor so they can actually hit people
If I get permission to do something like this, I'd be willing to do this once a week or so.
Here were the original patch notes:
http://www.tski.co.jp/baldio/patch/20011107.html