While resiliency of construction is an important consideration, I really wouldn't make that the highest priority for selecting a handgun grip. Grips are all about fit. Without a good-fitting grip, accuracy can really go out the window. If you can go to a gun store and feel several different designs of rubber/nylon grips, you might find one that's pretty close, and that would mean you're lucky and could go with that.
To me, the K/L frame is a double-action service pistol, or if a field gun, it's a small-game (target-of-opportunity) type gun, and therefore, we're talking double-action shooting. For double-action, the ultimate is a Fuzzy Farrant or John Hurst style stock. Unfortunately, those are hard to come by and kind-of expensive.