I have a couple of old Hilts molds, mostly Shad darts, that were machined for placing the hook eye either towards the front, or more center balanced and will pour them both ways.
I could see this idea working, but agree with efishnc that the connection would likely move a lot and have to be retied.
Still, folks thinking about and solving problems is a lot of what tackle making is about, so I hope the maker does well with them.