I'm thinking just shoot them around the wire assembly and rock it, Mr. Tom.
In inland saltwater we throw a lot of Gold Spoons and this is my idea for a lighter version of them, and cheaper, and possibly less line twist-causing.
There's enough plastic in those cavities to cast well but it wouldn't sink fast, so it wouldn't have to be retrieved fast in shallow water.
As of now, this is just an idea, I don't have the mold YET, although it WILL be obtained before too too long.
Just tossing it on the table for You Guys to have a look-see.
I'll wrap some .031" or .035" or .041" wire on a rod, I already have some 3/16" brass rod to try, but may need to step down a little, may use the shank of a small screwdriver. I'll leave a tag end on each side of the coil. Curl the free ends of the wire form that runs through the lead cavity, curl the tag ends of the coil onto the hooks on the wire form to hold the coil in place, BAM, shoot the bait on the form and the coil. Solid. Roll with it.
At most, maybe add eyes, cover-dip the head, clean the plastic off of the forward wire eye, hang to cure. Done.