I know it is a little after the event, but I bought a Casoli double bubble screen.
It seems to work fairly well although I went for a light smoke so you can still see the back of the clocks etc.
Just changed from a Dainese helmet to a Shoei X1000 and as the helmet is so much lighter my head is waggling about abit in cross winds, but as I get used to it, it appers to be getting less of a problem.
The screen has made a huge difference, the quality is good and once the wing mirrors were off (to relax the top fairing) it only took time and some harsh language to get it all fitted.
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