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That might be the problem as the material may discolour with the heat cycles/uv infra red too.
Lexan and plexiglass do have a technical support so might be worthwhile to drop them an email.
Thinking about this laterally, you can get plastic splashbacks/wall coverings in commercial kitchens, that stay smooth for cleaning and may cover the heat range that you need.
Think you are looking at either polycarbonate (tradename lexan) or acrylic (tradename plexiglass)
You would need to look at the specs of the materials if they fit the extreme heat exposure.