I don't think there's a ready-made version available, like Pachmayr markets for shotguns.
I installed a Decelerator on mine and it definitely softens the blow, although there's no getting around the basic physics here!
I have installed these on a number of guns without refinishing the stock. I could go on in more detail, but basically what you can do is put masking tape or duct tape over the stock and sand to/into the tape without going through it. You wind up with a *very* thin line of excess pad, but it is something you only detect by feel, not sight. IMO you need a bench sander to do this, and even then it requires good light and a very steady hand. Let me know if you want a little more detail on this.