This is what was done with wikimedia.org.uk and .co.uk
oddly, not with wikipedia.co.uk and .org.uk, which both redirect to
en.wiki. Their choice of the six languages to list is a little odd,
though - sco. has about 1300 pages, whereas gv. has under 20!
There was never a decision to exclude sco. The Scots Wikipedia didn't
exist until June 2005. I created what became the portal in September
2004 <http://meta.wikimedia.org/wiki/Image:Portal.png>. Which reminds
me... I just randomly pasted in text from the intro on various
Wikipedias and as far as I know, it has never been checked by a native
speaker. It was meant as a demo, not something which would really
become wikimedia.co.uk. :)
This would be better as the Wikipedia portal, not Wikimedia one, since
it's excluding the rest of the projects and saying nothing about the
Wikimedia UK chapter.