Eh, what the hell. The more I stare at it the more I can see it working out. Go to a JY, buy a cheap rear bumper and start playing. I like the last idea best with more white, but I do think you would need to get the 4" duals, 3.5" would look too small. Gotta do it right, but don't get squared ones, they would really throw off the curves and lines on the rear.

Whats the worst that could happen, you mod the other bumper, paint it, pull the tips off your exhaust and fix these up in the middle and see how it looks, if it looks good then you customize the exhaust to work to the middle.

May even consider trying the SS Center tips if you like them... they is pricey but I think it might really set off the different look and be easier to work with as they whole setup is HUGE.
93-02 Camaro SS Center Mount Exhaust Tips CME Used | eBay


These are rough, but polished up or painted and they would look really clean against the white.