Taking provinces from colonial subject nation

[HERC0]

I created a Colonial Canada subject nation a while back, and started feeding them provinces in Colonial Eastern America. I didn't realise that this meant I or my subject would not get the Treaty of Tordesillas event for Eastern America once reaching 5 provinces.

Is there any way to get these provinces back to get the event and establish a separate colonial nation?

 

[Olterin]

You could try losing those provinces in a war and then reconquering them. I think 100%-ing a poor native tribe who would be able to take the provinces in question, forcing them to take the provinces, and then waging a second war to take them back, this time under your control, should work. Never tried this myself though.