As a Windurstian on Gilgamesh, all I can say is bravo, sir. /salute
If this can be done with ANY amount of consistency, I would be happy to give up my outposts and see the stories of the other two nations. You mentioned the diminishing returns issue... I wonder if the amount spent could be lowered by having several people work together to do it. I'm having trouble finding the information you mentioned posting.
If that's the case, I could totally see a shadowy cabal of players meeting every so often... "Okay, San d'Oria will have Sarutabaruta this week, Bastok will take Ronfaure, and Windurst, you're stuck with Gustaberg."
XI Wiki


