This is what was done with wikimedia.org.uk and .co.uk - though, 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.
Angela.