Rear Seat Luggage Plate

Hi, has anyone seen a rear luggage plate that fits over the rear seat where the solo seat cowl would be?

I've seen the OEM one and the SW-Motech one but they all mount to the bolts under the rear seat and stick out the back. 

I'm thinking something to sit over the top of the rear seat, this would provide a back rest for long trips when using a bag or box, whilst also keeping the CofG from being moved to far rearward.

There's also the option of getting it color matched to the bike, so it blends in or stands out depending on your preference?

What do you all think?