I have been riding a Suzuki C90 Lehman trike for the past 10 years and 52,000 miles without a windshield. I have been using a 3/4 helmet with a face shield.
I just bought a 2011 Tri Glide (11,000 miles) with the stock windshield. I have been riding with my helmet without the face shield with either sun glasses or clear safety glasses. I don't think the windshield has made much difference. I like the wind in my face and don't like looking through bugs. I could reach bugs on my face shield to wipe off riding (sometimes with a little spit). Can't do that with a windshield. I am going to remove the windshield tomorrow and try riding without it. A short windshield will probably be just for looks.
I have seen a couple of threads about how to determine how talk a windshield should be. My questions for recommendations for how short a short windshield should be and tint if any. I have seen new short windshields for $16 on eBay. Probably all made in China but at 6 inches, it should not matter when that short. Taller ones may need to be better quality.
Recommendations on height and tint will be appreciated.