I was thinking of doing something along these lines as well, but would prefer a more "stealth" install that lets me run without plates most of the time, and only attach them when I have to park in a public place that could get me ticketed. Instead of using the Dual Lock to directly attach the plates to the bumper/nosecone, what about using it to attach an angle-bracket mount (like the one from Skene, or a home brew alternative) to the horizontal space under the bumper? This way you still get the non-permanent mount for the front plate, and don't have anything at all visible on the front end if you feel like going plateless for an evening cruise...