Tips: Depending on local laws, 3M UV blocking film, not tinted. It deflects most of the UV radiation (this is better than those reflecting window blockers you see in parked cars, those actually heat up the interior as the air gap makes the air circulate between the glass and the foil).
White fluffy towel like surface on the dash. This stops the light bouncing into the windshield and then into the car.
White steering cover. And break the kitty and pay for a white wrap for the car. In the coming cars, any other color option will not make sense anyways.