Dennis, I had our mesh type shades made when we were in Las Vegas many years ago. Why couldn't you have the same shade made with a solid material? That would block the uv and keep the glass from transmitting the heat through the glass. IIRC ours were made by RV Shade Guy, but I know there are a bunch of these guys around, they show up at the RV shows all the time.
Dave, Bobbi and Fenway
2005 38' FDTS Alpine Limited, 2016 Jeep Grand Cherokee Limited
Lake Wales, FL