I know I have kind of all ready suggested this,but would it be easier to set up quests if it was in a whole new separate area?
So for example: The npc by the Golden portal is set up so he gives you access to enter the portal but only after you reach a minimum stat requirement so noobs don't just wander in. Like 100 hours,100 bks,and 100 pks. Then when you enter its like another dimension or universe or something and your life switches to hera hearts or whatever and it would be basically a world for questing. It would be completely set apart from the main map and when you go back through you would go back to your normal LP system.
I just thought it might be easier that way instead of trying to intergrate it with the current map/system.