If you must monkey with that gun, Galazan has a reddish brown hard rubber pad in 1/2" thickness. Jeff's used to sell it as well, but no longer. I think you can also get it from Brownell's. The maker's label on the inside of the backing plate is "B.M.R."
How about a simple butt plate, such as the one CSMC uses on the RBL? That way you won't have to shorten the stock as much to retain LOP.
I have one of the reproduction Winchester 1922 Patent Date Pads (probably from Galazan, but I forget) on a Parker VH 20, with the Win info ground off, and it looks fine on that gun. Only did it to increase length of pull, and stock still has the original curvature.
