"...hoping they would do that for Canadians too..." They've been doing it for eons. Asked RCBS that same question 30 odd years ago, by letter. They sent me a list of their Canadian retailers and a package of 6 about 2 weeks later.
You'll find 'em in any gun shop. Meanwhile, take one out of another die.
"...used set of dies..." Their warrantee is on the kit, not who bought it. They'll fix any problem, even if you caused it.