Wow! What a fabulous, creative solution. Where I live, I can get away without a front plate at all --well, I get a ticket on my various cars about once a decade (on my Roadster) but this might work great for my son who drives his Model S in The City (San Francisco) daily. Please PM me if these go into production.
Hmmm..I have been driving in the SF Bay Area (including lots in SF) for 20+ years without a front plate and have never gotten stopped or tagged. Yes, lucky, and, yes, against the law in CA, but I know that I am not alone.