[@AltRightHero]I had a similar idea before. I made interest thread here but it turned out to be more successful on a different site:
https://forums.sufficientvelocity.com/threads/infinite-horizons-the-futuristic-nationgame.26101/
Feel free to steal bits of inspiration from there if you want.
As for nation ideas I have a few but I am sort on time to explain them in detail.

- Kingdom of Neo Hungary: Basically a constitutional monarchy with the old pre-ww1 Hungarian territories.
- Socialist Republic of Germany: Think of a neo communist Germany which builds on the fruits of the 22th century science rather than Soviet ideas.
- Helghan Empire: A Greek-centric fascist empire.