Only reason I want a flyscreen is to keep bugs and dirt from getting on gauges backside and being a nightmare keeping them clean.
If that is the case ... upside down helmet face shield.
Back in the dark ages, I fab'd an arched metal band and installed "snap buttons" to match the ones on my helmets. Then I could carry my dark shield, as a bug shield, after dark and visa versa. Very handy. Plus in a parking lot you could tell who was just a nag.