I've had to grapple with this issue, particularly when sitting on a committee dealing with Haida Gwaii and the creation of areas around Haida Gwaii. I have to tell you that some of the problems we faced were in trying to apply the IUCN designations. They did not, to me, seem appropriate to our circumstances.
In that context I'm a bit in favour of a made-in-Canada definition whereby we all agree that this is what we're trying to do and this is the way it applies in this area.