Just eliminate the zones all together. Move the 6-man instances to the PvP zones (border kingdoms) and whatever few quests there as well. Populate the PvP zones with the same mobs.
Doing this will keep all the content to 3 zones rather than 6 and provide people with PvP opportunities. The Border Kingdom zones should be dangerous.
Also, add something like the Tower System to Poitain, it fits the lore of that area. Perhaps do something similar in Border to Kush, but with Idols.