Just get rid of the GC stuff entirely, so what if it breaks the "lore" reason, the lore part is dumb and make little sense anyway... why would three GC's be stationed in that area with "high tension" against each other, like some childish squabble when it's already established the three nations are allied for a cause, wouldn't they be stationed there to defend the zone from, oh, I don't know, Garlean forces or any other outside force, including shutting out that liitle gremlin guy?

He may have jurisdiction and a hold in Ul'dah, but he doesn't hold anything over Limsa and Gridania, they could shut him out.

TL;DR - The GC restriction is pointless and serves no purpose, makes no sense, especially not lore-wise and only acts in negative ways, no positives.

If they want to keep this silly GC thing, then remove the restriction and just name the teams - Adders - Maelstrom - Flames, there, sorted.