Did Maxima die off-screen and I forgot about it or are people ignoring the one actual Garlean who's open to reconciliation, we personally know, and already has political clout in the Garleans' eye? After all, even if Dany says the Populares are no more he's obviously missing HIM, and after all that Zenos and Dany have done butchering the people, I'm sure the remnants of Garlemald would be very open to work with the one person who's on their side (after all, Maxima didn't so much defect as had an attempt on his life and is basically a refugee, I don't think he's actually decried the nation, just the fact that the previous Emperor was an Ascian) already has diplomatic ties among the Eorzean and Othardian Alliances.