I think it will not be difficult for the languages we just mentioned to find competent individuals who can fully interpret between the two languages, whether it be English and Cree, French and Cree, or English and French and Inuktituk. For Dene, I'm not certain about the possibility of French and Dene translation, but I assume that there may be individuals. As you get further west, for sure, and especially in very small speech communities, finding simultaneous translation between, say, some of the west coast languages and French may start to become fairly difficult, but simultaneous translation with English, I think, should not be a problem.
I know the issue was raised about relay translation, which would certainly be an issue for some languages and French.