I could imagine setting the piercing so that rather than having a screw attachment, setting a countersunk magnetic attachment point, so you just click each side of the glasses on or off, and you could have multiple styles but with the same magnetic attachment point. Prescription sunglasses, etc. And if someone punches you they'll just fall off. These countersunk magnets are strong enough to keep sunglasses clipped to the appropriate frames on a speedboat, so I think that would work out quite nicely.
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