Avoiding Realm Divide?

[Maltz]

I also read that there is a trick to make rather friendly vassals (to trade) after the Realm Divide.

Edited: I later confirmed that some statements I read is wrong (or has been patched), so following content has been edited:

Vassals made after Realm Divide are totally unaware of the Realm Divide. There are two Realm Divide triggers - when your yellow fame reaches maximum, and when you occupy Kyoto. Only make new vassals after both events trigger.

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.

You can 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.