Indeed I've seen Germany break off Normandy and Brittany from France.
Those are vassals you can release - after annexing France obviously your belligerence will go through the roof which makes the AI want to release vassals. I don't know if there are actually events for them - if there are, I have yet to see them trigger. Occupying every last one of France's provinces outside of a territory the event would never check for since it traditionally belongs to Portugal should certainly be enough to trigger any sort of capitulation event. I'd love to be able to hand France over to Nationalist France, really (without going into Open Negotiations and manually clicking through each province).
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