Either way, I'm not sure that doing that intentionally would be considered "normal wear and tear" although it may look like it (difficult to prove... don't do it). Also, through your method, it sounds like you would be breaking the following in the same rule
Quote:
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Specifically, the addition of cleats, studs, carved treads, alterations to the wheel profile, high-traction surface treatments, adhesive coatings, abrasive materials, and/or other attachments are prohibited.
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You'd somewhat be "carving" it and by the word "grind" you're at least applying an abrasive material.