I've been working on this for a few days now and the project is almost complete.
It consists of 4x 3D printed components joined by 12x3mm flat bar.
A left and right stabiliser are clamped to the accessory bar and the lower bracket slots over the dash and head light frame, forming a triangle.
The advantage of this configuration over others who have made braces that attach to the winglet holes is that this once I paint the aluminium is almost invisible and blends seamlessly into the bike.
I'll post more pictures as I complete the components and begin field testing.