I'd black it out....with paint! Talked to a guy a few months back who did that on his V-6 car and got the vinyl sticker on fleebay and from what he told me it was a poor fit and he could see red paint around the fake filler cap where the sticker went around it.
Depends on where you live out here
I do like the ribbed idea, maybe if you spray the flat finish, do it in a mix of flat and satin to fake the ribbed panel look.
Now that I look at it more, I'd even black out the parts orf the deck lid, bumper, and quarters that surround the tails, and I think the chrome tail light trim would help set that off. Just leave off that goofy looking third brake light trim, who ever thought that looks good needs a Jethro Gibbs headslap.