I find that offering vassalage is pretty easy as long as you do it right...
To get an easy vassalage does require you to part with one province though.
Here are the steps that seem to work for me...
Move in with your diplomat, click on the vassalage option and see what it rates at.Usually, it's "very demanding", so you need to do some work:
1. Gift them a province (just gift it, without asking for peace or vassalage)
2. Check the rating for vassalage again...it *should* be "Balanced". No, don't offer it just yet. Bump it up with cash until it rates as "Very Generous" and THEN make the offer. They'll most likely come up with a counter-proposal for more money. Agree to that and voila: you got yourself a vassal.
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