Not Canadian myself but I like following news from the country, and so I also keep an eye in posts from lemmy.ca. That said, I don't remember having seen a community for a similar proposal. And considering the changes worldwide and how province-related issues in my own country seem similar to Canada's, as an outsider I think there's potential for discussion right there.
Also a tip, there's !newcommunities@lemmy.world you should also be able to post to, in case you want to reach a broader audience. And you should be able to make a mention to the community in threads and their comments with [!ProvincialDiscussionCanada@lemmy.ca](/c/ProvincialDiscussionCanada@lemmy.ca) (like I did in the previous phrase) so other users can quickly access the community, and not have to reconstruct the link or look for it.