Zoning to lose aggro vs. Quest ?

[DanCanDo]

I was curious, with the typical scenario of a player zoning to get rid of aggro
from an npc, is it possible to set up an npc quest script with a proximity and
something like sub EVENT_ENTER that will do the same hate wipe as zoning ?

Just something I am playing around with, if possible, wanting to setup a "safe"
area in a zone, that would enable the player to run to with any aggro from any
npc.