Just thinking out loud here .... but, what about Bluegill guts/heads or even Crappie heads (maybe even soaked or sprayed down in Shad scent) ??

Around here, chicken livers/gizzards are a mainstay bait for Catfish ... and chicken breast soaked overnight in strawberry jello has also been a good alternative bait. I've even used Beef Melt (beef spleen), back in the day