I told ya'll motherfuckers to play this shit. Though when Zebrica will actually be released - nobody knows. It's been teased for over a year now. For anyone that doesn't know, the Kirin live on another continent that hasn't been released yet, so this guy isn't out yet.>>12301
Yes, I really like having a different map, I wish more mods were like this and had a non-Earth map, like fantasy worlds, or sci-fi, alternate universe, whatever.
As for the Pax Chrystalia, yes, it is a very good and cool path. I do have to warn you that this is the closest that the game gets to TNO in terms of narrative, tone, et cetera (though plenty of other countries have good and immersive narratives, none of them emulate TNO as closely as this).
Anyway, as for who you should play next… well, if you like a big war, then I would recommend maybe playing one of the Griffonian Empire states, as they have to fight to reunify the nation after the death of Emperor Grover. There's the Griffonian Empire proper (supremacist theocracy or maniac autocracy), Feathisa (the Netherlands, liberal monarchy), Strawberry Duchy (deranged Queen, or possibly a socialist route IIRC), Yale Rectorate (University state, this is one of the harder paths), or Bronzehill (Diamond Dogs, can pretty much pick any ideology that includes reunifying the kingdom including monarcho-socialism - I had a lot of fun with this one). Then there's others that I forget but they'll all be in Griffon Empire yellow at the start so you can see them all.
Alternately, you could try the Aquilean (French) Revolution, or Wingbardy (Italy) which all have their own spheres to dominate.
Or, you could try River Republic (and other countries in their bloc) and create the possibly-socialist Eurozone.