FlightPath...
I have never seen such a thing and I don't believe it exists in Canada. I've looked into this before as I used to teach multi-IFR and I'm quite sure Canada doesn't have those rules. It makes sense that the category doesn't change IF you base it on Vref for the MCLW. The way Canada does it is by the indicated speed at which you're operating for the particular maneuver.
I think there's a bit of a problem when you base it on Vref though, as you will be flying significantly faster than that while circling. The aircraft I fly, we circle in cat C, fly to the MAP on a precision or NPA in cat C but our Vref is cat B. The Canadian way seems more restrictive. It's entirely possible we could fly our approaches and circling 5 knots slower so that everything is in cat B though.