The only downside for me in that whole scenario is that the L frames are just a bit too big for my hand. And that's why I recently acquired a 20 year old K frame that is just the cat's meow (a nickel-plated 19-6). The price was quite reasonable too.
I hate to burst your bubble, but the K and L frames are
dimensionally identical through the grip frame and trigger area. Grips (aka stocks) are interchangeable. If you look through shooting supply catalogs, you'll notice that the same grips are listed to fit both; in fact, many places list them as "K/L frame". Take the grips off the K frame, put 'em on the L frame, and see if that fixes things.
OTOH if the problem is the L frame's
weight, that's a different story.
How comparable would the SSR be to the 629 6"? I haven't been able to hold one but I'm guessing it would be a little better balanced being a 4" and maybe a little lighter being a .357 as opposed to a .44, am I right?
Make that a
lot better balanced and a
lot lighter, and you're most of the way there. The L frame also has a smaller grip frame with a shorter length of pull; it's generally a more comfortable gun for people with smaller hands, which was the impetus for the development of the L frame in the first place.
I've followed along with the OP's thread in the "Revolver" subforum. My advice is to look for a 586 or 686 with the
6" barrel. It will give you the flexibility of .38Spl/.357Mag ammo in a platform that feels more like the 629 you liked. A lot of people swear by the 4" barrel, but I like the additional sight radius and muzzle-heavy feel of the 6", which is why I have one.
As MrBorland says, there's really not any functional difference between the 686SSR and a garden variety 586/686. The SSR is tuned, but any 586/686 can be tuned with the money you save, especially if you buy used. The SSR stocks are cool, but stocks are easily swapped with the removal of one screw, and oodles of choices exist (see above). The regular 586 and 686 are available in pre-lock form, particularly the 586 because regular production ended prior to the ILS era. The only thing you'll miss out on is the SSR's sexy barrel.