I am doing a bathroom remodel and want to replace my bath/shower faucet. It is a 2 handle system now and wonder if there is a replacement that will convert it to a blender faucet. The bathtub is a plastic one piece unit with walls so really don't want to replace the tub if it can be avoided. So need something that will attach to the existing plumbing but will have a plate that is the blender faucet. Anyone have an idea.