Is this possible?

If not mistaken, currently the country name is limited to 32 chars.

I think it's already long enough.
Allowing longer name means more chars will be flooding in news room/ GHQ news/ eestats news when they attack/ getting attacked.
Prefer to keep it at 32 chars if no special reasons.

I mean..

The United Kingdom of Great Britain and Northern Ireland

Yes, technically, they could be very large, but too long would wreck the UI.

Or maybe you could have a full name and a nickname. The nickname is limited to 32 characters and what appears in the API. The full name appears ingame (alongside the nickname).

But I can see how that would be abused to confuse people.

All I know is last night I needed 33 chars.
I wanted to use a song title.

That's only 2 characters. UK :)

It's not about the length...

It's all about the font size that matters!