Andy: there's a 100% clear, frame-mounted universal fairing out there (the name escapes me, unfortunately) that was first marketed in the 1970s, then recently came back for the V-twin craze. It comes in regular height and extra-tall height. I'll try to find a link to one, somewhere...
It's current: I saw it last Fall in a bike shop for sale, new.
The reduction in fatigue is so dramatic that I don't ever ride without one, even in town riding. Typically, with any of the frame-mounted fairings, speeds of 50+ MPH will keep the rain off of all but your feet.