I like the principle of the idea. I'm not sure bristles are good enough at blocking air, but what about plates of rubber or flexible plastic? Stiff enough that it doesn't flap violently in the breeze, soft enough not to damage a tire when you hit a pothole while turning. Maybe even partial spandex wheel skirts with a flexible wire frame for support. A wheel skirt doesn't need to cover the whole wheelarch, just the gap between the fender and the tire.
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