Welcome to the forum J. Meyer.
Establishing some cover for your forage is probably a good idea. You can consider sinking some Christmas trees this winter.
Are you against stocking any other species as forage as well? I am assuming by shiners, you most likely are referring to golden shiners(GSH). To diversify the forage base, you can consider adding fathead minnows(FHM). I would stock a small number this upcoming spring, perhaps a couple hundred that you can hand sort to ensure there are no unwanted hitchiker species with the goals you have in mind. I would also consider stocking some yellow perch(YP) this fall before it gets too cold. If you stock advanced fish, they should pull off a spawn in the spring. Then you can stock your walleye(WE) next fall into a diversified forage base.
Next fall I would stock around 50-60 WE. You should be able to get yearling fish at 7"-9" in length.