They're currently on my retro bike which is a 12.5" 1996 Ball-Burnished GT Zaskar, which has a full M950 XTR groupset and 1996 Judy SLs which, suprisingly, still work just fine!
I know that the "easy", and probably most sensible option would be to do exactly as you say, and get a modern XT chainset - But I really really really want to try to keep the bike original, and avoid fitting new parts unless I really have no alternative!
I'm going to keep hunting around to see if there are any replacement chainrings about - If not, then I've spotted a lovely set of Cook Bros cranks from back in the day that would compliment the bike just fine 
Cheers for the advice though 