Sorry for the late comment, it turns out that Marie Brizard Essences Violette IS on Difford's Guide. The info even says that the violets are harvested in Toulouse to make the liqueur. Maybe you might know more about it than you think? Or was that MB's provided information? Eitherways, if I was in a better country, I'd have been more than happy to send you a sample of it for you to taste. I do find it kind of curious that there are so few MB reviews.
This is the 'version' I'm talking about on Whiskybase: https://www.whiskybase.com/whiskies/whisky/98714/canadian-club-imported . Next to no info unfortunately. Additionally, your second point is interesting, as it is the linked page for Canadian Blended Whisky. Do you remember how the bottle looked like when you tasted it in 2015? Was it like the old photo? Or was it the newer style which did not feature a separated label?