You could, on your globally available wiki, edit the welcome message on the dashboard to include links to the country-specific wikis. That way they would all be joined (very simply) and everyone would know where to go to find the links to the appropriate wiki.
And with permissions set correctly, users would only be able to see the wiki they're entitles to.
Otherwise you might have to do some major rebuilding to the dashboard that would disguise what's actually going on.
If you've got the budget and time, the latter option might be the best way to go. If not...
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