Try Piragis. They once offered something like this - iirc it was based around food and chefs but they leaped to my mind when I read your post.

I will say from a purely practical point of view, if all your packs are in the sherpa canoe, yours are without ballast which I find necessary. Just be prepared. Maybe three in a normally two man canoe overcomes that and saves portaging canoes - assuming the sherpa is ahead of you.