Cars are a very unimportant part of changing to clean energy.

The most important part is the generation. Making specific types of cars required right now is VERY premature, and will just cause backlash.

Let's focus on just one (main) thing: Clean generation of electricity. The rest will come in due course.

EVs are 3 to 4 times more efficient than ICE vehicles. So just converting to EVs is a huge efficiency gain. In fact, if we electrified industrial and transportation using existing technology we could reduce energy demand by up to 40%. And as you recommended, power generation from solar (where/when feasible) removes the need for ongoing fossil fuel purchases.