XC - the recoil reducer will increase the gun's weigh, move its balance rearward (closer to the trigger), and increase both mounted and unmounted swing efforts. It should not affect stock fit, gripping area characteristics, aesthetics, or maker's name. Only your client will know if the gun has lost "pointability," because only your client knows exactly what "pointability" means to him. I'd guess that he is subjectively combining weight, balance and swings, with swing effort the big hitter.
What I can do is give you the following estimation of objective changes. Starting with an average game gun of 14 1/2" LOP, 6 1/2#. 4 1/2" balance, unmounted swing of 1.45, and mounted swing of 6.4. Adding the 9 oz reducer (assuming it has its balance point 3" forward of the butt, the gun now weighs 7# 1oz, the balance moves rearward to 3 1/8", the unmounted swing goes up to 1.73, and the mounted swing goes up to 6.46 (trivial amount). Except for the mounted swing, these are quite noticable amounts of change; weight up 10%, balance rearward 31%, and unmounted swing effort up 19%. Definitely take more muscle or more time to change where this gun points.
Does that answer your client's question? Additional questions?
