I wonder if anything you use that is fine enough to not leave scratches would more polish the screen rather than slightly dull it down. Thus you'd worsen the glare problem, not make it better. Anything that was rough enough to dull the glass rather than polish it would likely leave visible swirls and other random patterns that would probably drive you nuts. I'd certainly try this out on a random piece of glass (or better yet, try it on a clear sheet of acrylic or plastic - is the top screen layer on the Sony actually glass, or is it a plastic material?) just to see what happens first.
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