> It wouldn’t be full Chexit. Just renegotiating and then rejecting the Schengen chapter. It would then be up to the EU to execute its Guillotine clause.
This is pointlessly argumentative, but I'm just going to continue having a conversation using the terminology brought up by the OP and what I interpreted them to mean. It seems to be working just fine for us.
It has treaties, but not membership. That doesn't make it "leaving" if they annul the treaties.