I can take a first shot at that.
The G7 initiated—but it's gone beyond the G7 now—a climate club, more focused on industrial decarbonization for exactly the reasons you're talking about. It's the idea of co-operating among all the willing countries on a number of things but including something like a mutual agreement on regulatory measures, which would raise the cost of production, at least initially, but would also shut out those countries that didn't commit to those kinds of regulatory improvements.
I don't see why you couldn't apply the same principle in the context of agriculture. That climate club is existing and looking for an expanded mandate as we speak. There's also the industrial decarbonization agenda at the G7.
That kind of a club idea strikes me as the one way you could deal with that, if you weren't talking about prices. If you're talking about prices, then you probably want a border carbon adjustment for Canada. Again, I wouldn't go there with agriculture.