Tagging a few server as "international" isnt such a bad idea!

maybe add some further infos, that those servers are exspecially for those who want to meet diffrent players from diffrent regions. and keep the data center "hidden"

To your idea with the percentage:

How do you want to calculate it?

- All player currently ingame?
- All players that are registered to that server?

With both of these ideas problems will occur