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How about metallic window film (for home windows)? I've done it myself once, it's not that hard and since you're not putting it over the windshield or side windows it doesn't have to be perfect.
For side windows and windshield, 3M Crystalline film is very expensive but almost like magic. My windshield has it and my side windows don't, and the direct sunlight coming through the windshield feels cooler than the highly refracted light coming through the sides at noon.
Metallic film on all windows would kill GPS signal, but on the sunroof I imagine it can't be much of a problem if most cars have metal roofs that don't cause problems.
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