Dale, congratulations! Everybody needs a classic Pre-Model 17, the world's best .22 revolver.
Can you post photos? Alan is correct that the hammer you mentioned would not be a true humpback hammer, but I'd be interested to see what actually came on your gun.
Don't be too quick to give up on the mismatched football target stocks. That pattern was available when your gun was shipped, and some of us think the target stocks both look and feel better on the Masterpiece revolvers than the standard magnas.
I don't have a postwar K-22 with a target hammer, but the hammer would look like the one on this 1950 K-38. The firing pin is in the frame on the .22, of course.