One of the issues of declaration goes back to the Canada Seeds Act. Under it, you can't name a variety unless it's certified. That's one of the changes that would have to happen. Under the Seeds Act, you cannot name a pedigree variety as its own, or even say it's anything like that, if you're representing it. I don't know the implications of the overlaps in this case.
As for farmers knowing what they grow and making the declaration, I can't speak for the wheat buyers, but most of the people know what they're growing. However, if they're buying brown bag seed and they're buying it from their neighbour, there might be implications. For example, someone might say he was sold Elsa and bought it from his neighbour, when it was actually Grandin wheat, or one of Dr. Fowler's winter wheat varieties. This happens.
Certainly, a little more money in the agricultural sector would allow them to have access to certified seed more often, which would enable this to work much better.