So with the screen attached, I went for a test ride of about 14 miles.
The screen was securely attached and didn't wobble or change position at speeds of up to 50 mph, despite the 1/4" gap between the halves of the clamps on the handlebar.
I was hoping that the wind would be deflected above my head so that there would be less noise around my helmet, allowing me to ride without earplugs and hear my helmet radio. However, the screen didn't calm the air around my head. Instead, because the screen only came up to my neck in height, what it protected was my chest, leaving everything from the top of my shoulders and above in the wind.
Although the screen fits in front of the dashboard, when I try to tuck behind the screen to be protected from the wind, it is uncomfortable fitting my head behind the screen. Not that I'm inflexible, but I do feel like I have to compress my spine because I can't slide my rear end further back to make room for my head without running into the sudden upward curve of the seat to where the passenger would sit. Also, with my head that low, I'm either knocking the helmet into the screen or craning my neck to look forward properly.
Initially, the windscreen was angled parallel to the forks. I will see if tilting the windscreen more vertically will help. If that doesn't help, maybe I can rest the bottom of the windscreen on the top of the dashboard to raise the top edge closer to my eye height, where I've had success with windscreens on cruisers and scooters.