You can get very strong rare earth magnets these days. You could fit one to a stalk off your front wheel nut to 'sweep 'the area in front of your leading tyre.
I've got two about the same size as those in the link. They will draw blood if the snap together with skin between them.
AU Super Strong Round Disc Magnets Rare-Earth Neodymium Magnet N52 25 x 20mm | eBay
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