Hoi!
We have the same problem in pms.wikipedia. While there is a unified version (called Koiné) there are also regional variants that include local graphies.
We solved the problem with a few ingredients: 1) no hysterics (those who are "too hot" on this problem cannot become admins) 2) templates showing which version is used on the page (although they use different alphabets they are mutually understandable) 3) tolerance, tolerance and more tolerance (after a 500 year long bloody religious war on one of our churches appeared a writing saying "Let anyone have it as they please", which still is our motto).
We are now trying to include in our wiki detailed articles explaining where these linguistic systems come from (there actually is a number of historical reasons behind any of them).
We also have a problem that is common to most weak languages: a drift towards stronger languages in our vocabularies. While our word PA has been exported to french the import flow mostly been brought us words from french (we were twice annexed to France) and italian.
The result was that we excluded the use of archaic piemontese terms from the interface but allow them (with a link and an explanation) in texts. There's nothing wrong in reintroducing almost forgotten forms of a language, but the wiki must remain accessible to all (not just to a sect of linguistic integralists).
Basically there is but one thing you need: understanding that insulting each other won't change a thing. Having political fights is the very last thing that will help anyone. NPOV means NPOV, not NPOV means "not a wiki", and "not a wiki" implies "not to be hosted here".
If we become convinced that something is not NPOV from the very start, then not even an ISO code will help. Hope both sides have this extremely clear. This may well end up as "no byelorussian wiki AT ALL". WMF publishes encyclopedias, not a soviet, antisoviet or pro-martian "pravda"s.
It's my last word on the subject, next thing I'm going to do is pick up all the delirious emails we get and use them to write a personal recomendation to the Board that I will difend in front of any Arbitration Committee.
Enough is enough. We are all adults here, so let's behave like adults. Can't you see that you make your Country ridicolous in the eyes of the world? Kak vam ne stydno, vsem?? Derzhite sebja v ruki v konze konzov!
Bèrto ‘d Sèra Personagi dl’ann 2006 për l’arvista american-a Time (tanme tuti vojàotri) http://www.time.com/time/magazine/article/0,9171,1569514,00.html