Uncle Mike's Grips work well
I've had my SP101 2 1/4" for over 10yrs now. The factory grips were too small for my hands (like to have all my fingers on the grip, factory model was too small for my pinkie).
I put on an Uncle Mike's rubber grip-pretty inexpensive, and it worked very well. Also didn't really add much bulk if you were going to carry.
As far as "taming the recoil of a 357"? You're going to be shooting that load out of a steel frame gun, which already has a recoil dampening effect. I've shot 100 round sessions with the gun, with no hand discomfort. However, I use hand grip exercisers frequently to keep my hand strong for shooting so that may also have a recoil reducing effect.
One thing I would recommend with the 2 1/4" fixed front site, is painting it with Testors iridescent orange (with a white undercoat). It really improved my ability to shoot accurately, because I picked up the site picture more easily.
Hope this helps.
Gerry