[pyg]

Yeah, DMG (Dom Mod Gen) a little utility that I was working on last year can do that sort of thing. I'm deliberately not linking it because it hasn't been updated for a long time. I do however have interest in helping you pursue this idea and updating DMG if you are serious and don't mind waiting a little bit. LA Ulm and EA Kailasa are completed and adding multiples of those nations is very straightforward, however adding other nations takes a multi-hour one time investment and then a longer period of bug checking.

What lch says is true as well, although there are only a few nations special *things* that can't be included. For fairness in this sort of mod, all nations should be copies with no one actually playing the original nation so the mistakes and limitations are universal.