Wonder if you could fill the scratches with some optically correct star chip filler like from one of those kits and then maybe buff out? That stuff gets injected into cracks and really almost makes them disappear.
I tried that when I worked at a glass shop, didn't really work.
I remember reading that the old trick was to use krazy glue to fill scratches then smooth it out. Would hide scratches for a day or two (long enough to sell a car:D).