An instance for all the country-themed communities right next to europe-themed is a nice vision. The former will probably grow slowly, but that’s ok and you can make sure that the foundation with multiple admins, backups etc is resilient - like feddit.org after the drama with feddit.de.
Feddit.org only allows German&English language in order to keep it moderateable. If your country communities allow the respective languages (besides English for adressing interested ‘outsiders’) that’s also a great vision, but I think you would better have native (or non-native) speakers as mods first.
Good luck!
[Edit: I meant competent speakers - they don’t have to be native]
Thank you! My first one is a strong animated short from the indigenous collection. https://www.nfb.ca/film/meneath-the-hidden-island-of-ethics/