Quote Originally Posted by Maltz View Post

There is also a "-100 past grievance" modifier for a vassal that you helped revive. This offset the +100 military alliance modifier. Well, this is a bug! They are not supposed to hate you for reviving them. But there is one way to avoid this modifier - revive a clan that has NO land connection to your territory at the time of the revival. This way the new vassal will only have the +100 modifier, but not the -100 to offset it.

So ship your army to somewhere far away and start reviving clans (that have a trade port to trade with you). This also discourages your vassals from turning against you when they get their full stack - they can easily find some other enemies to fight.
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Can anyone confirm this? If thats the case then Vassals post-divide just got useful again! This would be huge, I cant believe I never thought of trying this.