Better introduce a speed limit for SUV and ICE cars, and make it mandatory for them to use the right lane.
No speed limit for electric cars. Helps adoption and Germany keeps one of the last things that make it special.
Or just generalize it. Why bother with labels? Manufacturers will make technically-not-an-SUV to get around it. Make sure the emissions of a particular model are known to the owner and set permissions based on emission levels, since emissions is what we're actually trying to optimize.