For bank fishing, I like to be as simple and unencumbered as possible. I want one rod in my hand... and that's it. After trying everything, I settled on a 6'10 MHMF (happens to be a Megabass Orochi XX Spinnerbait Special) for literally everything. The only thing it can't do is heavy cover frogging, but I don't do that from the bank anyways. With this rod, I regularly fish paddletails, chatterbaits, spinnerbaits, texas rigs, smaller jigs, topwater toad baits in sparse cover, and more. Heck, I've even thrown dropshots with it successfully. You could also throw crankbaits on it, but I'm not much of a treble hook guy. I've caught bass, walleye, perch, catfish, and drum with this rod. No joke.
If I'm going to stay near my truck, I'll throw in another long/heavy rod occasionally with braid so I can throw a frog for fun... but honestly, I could just carry an extra reel spooled up with braid and throw a frog on this rod too, if I really wanted to. Honestly, when you're trying to keep it simple, it's amazing how much you can do with one rod.
With all that said, if I was going out on a kayak with your two rods (which are good all around choices), my third rod would depend on what I threw most often. I love topwater, so maybe I'd bring my SA735C to throw frogs... or if I was going to throw jigs/t-rigs more often, I'd bring something like my Tatula 711HFB. I guess it depends on what you wanted to do most often. Something like the SA735C spooled up with braid would probably be my choice, as it could work for frogs AND flipping/pitching/punching. Very solid all around choice.