Take your reading glasses to your local hardware / big box / industrial supply store. Find a set of "visitors safety glasses" that fit over them comfortably, should be ~$5-$6. Drive to the airport, grab a marker and sit in your plane with both pair of glasses on. Use the marker to trace the panel outline onto the outside of the safety glasses. Then go home.
Put masking tape on the inside of the safety glasses below the marked line. Gently sandblast the inside of the safety glasses on all surfaces not taped over. Don't have a sandblaster? Use the one at work like I did (twice--student 172 set with silicone oxide, later Mooney set with glass beads). Or ask a friend, or visit a local machine shop, or the guy who works on your car, fixes your tractor, the farmer down the road . . . Or use some sandpaper by hand, anything 60-400 grit should work, but put them on to make sure you are done before removing the tape.
Texturing the inside is much better than the foggles in the store with texture on the outside, because when not if you drop them, the scratches won't change the texture and blind you when turning across the sun. When I'm through wearing mine, I've been known to toss them into the back seat; when I had electrical failure flying with CFII, I literally threw them over my shoulder to concentrate on the problem. They usually live in a Crown Royal bag within arm's reach, that my wife turned inside out and resewed to a shorter length so I don't have to feel around for them.