Why not start your campaign after the Hero warts are over, about 1700-1720. You could even go for later, but the later you set your campaign, the lnmore Glorantha may have changed, and the less recognizable it may be. Almost all (maybe all, I'm not sure) of the published history concerns pre-hero wars stuff,generally up to about 1620, and the outcome of the Hero Wars itself is pretty cloudy. You can decide how the Hero Wars finished, to whatever extent is necessary, and can redefine political boundaries as you want.
You still are in Glorantha, and you still have the geography, the creatures and Elder Races, the cults, the cultures, the basic sociology and social structure and all the other stuff. You never need fear being "Gregged", or run the risk of published material making you to need to re-write much of your campaign world. In addition, the PC's have huge opportunities to create history, or at least leave their mark on it, especially if all the Heroes are dead, or have gone missing, and the Hero Wars battles provide excellent adventure handles.
I started a campaign set after the Hero Wars many years ago, and it worked well. Admittedly, there was a lot less published material then, and so now it might be hard work creating a believable and appropriate outcome to the Hero Wars, and you as a GM still have to try and fit all the published material into something resembling a consistent and comprehensible (to you as the GM, obviously; the players and PC's can be in the dark) world, but it can be well worth it, especially for people that want to play in Glorantha but don't want to have all the "important" stuff only going on in the background.
Good luck
Geoff Pocock
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