I've been considering an alternative... a lengthwise "slit" or "slits" along the bottom length of the bike, with a "step" to it (them), so that as you lean into a side-wind, it opens that "slit" (slits) up to the cross-wind. It'd duct the air through the underbelly to the other side of the bike, to an identical "slit" (slits), pushing that air to the leeward lower-pressure side of the bike.
That'd provide a huge amount of porosity while not creating any drag in straight-line riding. Of course, that means the forward speed of the bike isn't used to ram air into the duct, capitalizing on the forward speed to contribute to side-wind cancellation.
Perhaps a combination of the two... ram air ducts feeding the horizontal slits. A side wind would force the incoming air to the opposite side of the bike due to pressure differential.
What do you think?