I've never seen or heard of a fairing specifically for either the FT or VT Ascot. That doesn't mean they didn't exist, I'm just not aware of any.
My first Ascot was a black VT that I bought in '87-'88. It had an aftermarket universal style quarter fairing by Vetter, if I recall correctly. It was a simple lightly smoked/clear fairing that extended from the top of the headlight up about 10"-12" high or so. It had a couple of curves in its construction to make it rigid & give it a "lip" at the top. It mounted to the fork tubes I think. Can't recall any longer. It was a real nice looking quarter fairing & really fit the VT Ascot well. My bike was the only bike that I've ever seen with that fairing. I've tried a few I'net searches to find it, but I think it was probably discontinued prior to the I'net.
There were more than a few cold rides home at night, while trying to hide behind that little fairing.
J.