shouldnt take much effort to build a small shade box for it to cover the direct sun like a visor, it may not be pretty but it will work. do some cardboard mockups until you find what works best then you can make a permanent one that's more finished looking to look like it was meant to be.
I would never do it but it all depends on the value you put into the finder so maybe if you sanded the screen with 600 grit sand paper or a green pot scrubber to give the screen a flat finish instead of shiny, it might dull it enough not to shine glare but not effect your view of the screen
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