It's definitely different, and looks like good craftsmanship. Just doesn't flow for me. I would probably trim the factory splitter for dual tips and make a custom diffuser for the ceter
Nothing major I do suggest to take off the rear bumper. Line up the 13-14 diffuser and trim majority of the bottom valance on the 10-12. Leave enough material on the 10-12 to cut slots for the clips on the 13-14 Diffuser. A few zip ties help, but I still have to tweak it add some plastic weld.
I like how you were thinking outside the box. It's a shame no vendor has made a diffuser for the 10-12's as an option. In any case, I wanted quads on mine too and did this.