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The GoPro with a suction cup mount is the way to go.
Maybe spray-mist some sort of water-diluted salt or calcium on the surface and go for a ride ? Once dried, it might leave a residue on the surface which might reveal the flow pattern.
I say that because we use a lot of salt on the roads here, in the winter months, and our cars are always coated with salt and calcium residue. Often times, you can see streaks which reveal the airflow.
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