It would be a policy call for this committee and the House of Commons to decide.
I would just note that we have to be careful. For example, for the opt-out, one would have to look at the nationality legislation of the other country in question, because there might potentially still be issues of unintended consequences. Those countries might not recognize retroactivity, for example, as a concept.
It might do away with that problem, depending on the legislation of the country in question.