One possible option for the committee, if the committee is really concerned that it might be too much, would be to invite parties that are registered with Elections Canada and that have at least one representative in the House of Commons to produce a written submission.
I'm happy extending the invitation to all of them. That would be my preferred position, but if there's concern about the magnitude of that request, this might be a suitable option B in the eyes of the committee.
I put both out there for the consideration of the group.