It is my opinion only but I ride a lot during winters. A windshield or fairing make sense only if you have a powerful motor on your e-bike and would only ride on the throttle (I am sure
@PCeBiker will be proud to demonstrate his windshield!) Otherwise, the air drag makes the idea rather poor.
I recommend you run a Forum search with the words "Winter" and especially "Minnesotan" (search for titles only). It will give you ideas how people ride e-bikes in the winter, and you wouldn't rather find a mention of a windshield there.