Well, if a 14 inch bass could take a 12 in chub I agree that there probably isn't much point in adding them. They probably could take refuge in the stream in the spring but it wouldn't offer them year round protection. I may stock some anyway just to see what happens, if they get eaten they get eaten. Would 100 or so be a decent amount to try or should I try more?
What I had considered doing was building a small weir across the mouth of the stream using railroad ties, then cutting a couple of wide notches halfway down into the top one to allow the water to flow straight into the lake with some current instead of having a waterfall effect. After this was done, I thought adding a pebble bed maybe a foot deep from the base of the weir maybe 20-30 feet out into the lake that could be used as a spawning bed as it would have water flowing over it. The water depth would be about 1-3' deep in this area. With RBS in the lake, I may still do this as I would think it may be beneficial to their spawn as they're primarily found in streams.
For the forage fish you listed, I'm guessing they'd all have to be collected in the wild? What advantages do bluntnose minnows and spotfin shiners offer over fathead minnows and silver shiners?