Why not try it the other way round- fix the stainless section at the bottom so the top stays clear (if you've got a clear flyscreen that is) - I'd rather be able to see where I'm going! My Roadster fly screen could be a bit bigger so I was thinking of "adjusting" it somehow too.
Just haven't found anything suitable - yet. Good luck! Give it a try.
I made a low grab rail for the rear to replace the backrest out of a bit of drilled strip that was lying in the shed, when I'm riding solo, for nothing. DIY beats £££ anytime!