I would recommend just molding in a rear bumper of your choice to the stock bumper. I molded a friends rear WW bumper into the stock bumper and id didn't look too bad. The point where they overlay took a lot of work to make is seamless but it looked good overall. Just a thought. Don't rule just altering an existing bumper to get the look your going for. It's work but it's not impossible. If you got a good bodyman with fiberglass experience and an eye for shaping you should be okay. Good luck.