Please welcome Eyoyo Underwater Fishing Cameras.https://amzn.to/3siEgXn
I believe plastisol is used to make a lot of soft baits - maybe try someplace like Jann's Netcraft to find some.
Auntie fished for trophy sized carp in the grand river of MI when I was a kid. She mixed corn meal and strawberry jello to form dough balls. They stayed on the hook for an hour or so, maybe oil would stay in something like that. The stawberry smell was pretty good and the fish liked it.