Is it a 3 piece take down or a one piece? If a 3 piece, I'm sure many reputable bowyers could make you a new set of limbs. If it is a one piece, I'd hack off the limbs and send it to a bowyer and tell them that this is what you want the grip like on your new bow. I don't have a lot of bow building experience, having built a few for myself and friends, but I think it would likely be easier to just create a new riser like yours than to try to get the glue and laminations off the fadeouts and put it in a new glue up.