Hi TXM. Although I voted not a good idea, it's your car and you should do what makes you happy with your ride. My suggestion since you asked is don't do the emblems.
I'm making a slight wheel modification myself - 17x9 GT500 OE Creations replicas with 255/50 rubber. I didn't want to change the total diameter nor the suspension components. I bought the running horse center caps to put in place. The reason I'm doing this is because Ford underequipped the GTs as far as wheels and rubber. The GT500 wheels are simply beautiful too. I was thinking of getting a GT500 bumper cover but my own feeling was I didn't overtly want to make it look like something it isn't.
Months ago, I spyed a 6 banger with all the GT emblems but the giveaway was the single exhaust. I didn't get a chance to see the front bumper cover. Obviously, the guy badged his 6 banger as a GT or tried to pass it off as one. All is good however.
Again, it's your car and you should do what makes you happy and not what others think.