I don't know how to do it to make it look good; probably can't but the air could be tricked to coming back to the car with vorticy generators. For instance:
Round objects create a substantial vorticy. An array of verticle post about at the door jamb would spin the air and help it return to the surface which would make a lower scoop work.
I doubt this would be pretty but this could bring about other ideas.
Gary
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