A good taxidermist can make that vertical cut completely unnoticeable. They can stitch together the two sides carefully and make sure it goes in a dip on the mount contour, and no one will ever be able to tell. The horizontal cut is a bit more trouble, but with some careful patching and good artistry it too can be made to look rather natural. I would keep that cape, it has a beautiful texture and color contrast.
Congrats on the buck, he is a real trophy in anyone's book!