OK, got the gist of the whole thing. I think an Rtv hand pour would be a start. Use a standard weighted swim bait hook , slide a paper clip through the eye to hold it out of the mold . slip a swivel onto the shank of the hook let it lay down in the mold. Use a dowel rod or something to hold the point of the hook out of the mold. Then when its poured you should bee able to pop the swivel out of the plastic for treble attachment. Just a thought to help get your gears turning.