It bothers me so much every time I check my character profile and I see the yellow twin adders of Gridania taunting me. I hate that place so much. Bunch of xenophobic tree-huggers.

I don't even care if any dialogue changes. Force me to go to sleep at an inn and "dream" about going through the first 15 levels for the new city-state I want to join. Make me pay actual money for it on the mogstation. Whatever solution you want, just let me change it. I am begging you. I beseech thee. /grovel

I know it doesn't really matter, it isn't mentioned more than a handful of times throughout the game, no one else can see it, but still. I would grind Praetorium 100 times if it meant I could change it. In my ignorance I assumed it would change along with selecting a Grand Company but alas, it does not. Why would you do this to me, Yoshi-P? What have I done to deserve such devastation?
A quick google search shows that people have been asking for this to be possible for at least 7+ years, so here's asking again, hoping that eventually they'll get someone to put 2-3 hours into just swapping some .png files around and tweaking some text files to make it possible.