well... there are those all are all nation mods.. you can just copy the wanted nation from one of those and give it any nation number you want and place it in the correct era again.
IMHO it's all already there.. copy paste edit nation number and era and you are done. If you can't find the all nations mod or whatever you call it I've also copy pasted that into the end of dom 3K so don't all nations in LA anymore so you could copy it from that too.. though the original should be easy enough to find.
About pretenders and nation specific spells I'm not sure how they are handled I'd suppose they have some solution for that too... arg I checked and obviously they just use the original nation numbers so there was no need for them to change that.. but your "new" copied nation will lack them..... so you'll have to do that too.
If everyone does one nation it will go fast anyway.. I'm not gonna do it though since I'll never use it myself
sorry
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