I dont think anyone from the EU is going to take concrete steps to a Canadian application, because they havent concretely ruled out that America wont physically invade it. Its an insane prospect, but this world is already insane.
The thing is, it's not actually that insane if you zoom out enough. We just convinced ourselves history was over, or at least over here.
Unless you know something I don't I suspect they'd still be open to a defence pact right now, especially with the American threats to Greenland as well. If we were to wait until it's imminent that would all change, and then it would be build nukes or bust.