I don't have any leads for that type of jig, but I've thought the same thing myself. I saw a dude using a type of homemade "gummy" grass shrimp jig one time. It looked pretty good. I'm also thinking about messing around with my fly tying vise and tying up some grass shrimp imitations on jigheads. It might be a fun project, if you have the inclination for that sort of thing.