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You can get small pieces of ordinary plexy in every home store. They are used, in various thicknesses, for the installation of window mounted air conditioners.
You could beltsand or grind it to a wedge, and then polish it, and use a blowtorch for final finish. Be prepared to put long hours to that task with mitigated results. You will get distorsions through it, it won't be adequate to read through. I've never gotten perfect results in surface prepped plastics. That is why I'd look for a molded piece.
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