clutch, most windshields won't do anything to take away that old, familiar ache in the hands from the cold. A Windjammer will, and probably some of the other large, frame mounted fairings like a Rabid Transit or an RT from some other Beemer. The Hippo Hands are the way to go, or heated grips or gloves, if you're willing to put up with wires.
I hate it now when my Windjammed R65 breaks down in winter and I'm stuck with my naked Triumph, as I haven't modified my fake Hippo Hands to fit around bar end mirrors yet. And I though I was done with that pain, sheesh.