I checked both of my Air Attack lenses Larry and sadly they are not clear.
Here is an idea though, motorcycle helmet lenses loosely match the arc of the Air Attack. I always Super Glue 3 strong magnets to an etched plastic to match the helmet magnets for my other lenses. This big clear lense is a full face lense, trimmed with a Dremel too, but I use velcro on the sides because it holds better. With magnets on the side it either detaches from the helmet on 1 side, or it pulls the magnet off (with repeated removal). The center magnet (1kg weight capability?) is connected with Japan's version of JB Weld. I etched the proper side of the magnet with 80 grit sandpaper.
My favorite visor though is a Shoei Cj-3. Mine is tinted but you should be able to get the clear version, or something similar. If you go this route just be sure to etch the plastic and the proper side of the magnet first a bit before you glue them on. Since you won't be putting the helmet on or taking it off multiple times using Super Glue should get you through the race. If it pulls off then it only takes a a short time to reglue it.
