Being a member of the European Economic Area is a more realistic goal and would probably solve Canada's problems derived from being far too Economically entwinned with their next door neighbour.

Mind you, any form of being part of the EU Single Market (which EEA members are without being EU members) requires a ton of uniformization of things like Product regulations (which amongst other things means Canada would not be allowed to import many if not most US food products such as for example beef of cattle which has been fed hormones) and acceptance of Freedom Of Movement for both people and goods.

(Following Brexit, Britain did not move to become an EEA member exactly because of both the Freedom of Movement requirement and the difficulty in getting other EEA member approval since the UK are a disproportionatelly large economy compared to all EEA members but Canada's reasons are different - not anti-immigration and xenophobia like the UK - so things like Freedom Of Movement would probably not be an issue and its Economy is just a bit over half the size of the UK's)