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I could see this working, seat belts lock based on a *clutch*, which engages at high pulling force on the belt. If the clutch, or something coupled to it can be attracted by a magnet into the locked position, it would always be locked.
The question is what is ours made of? I guess the first test would be to pull the reel out and use a magnet to see if you can lock it in this manner. Then it could be worth looking for a way to mount an electromagnet like the one in this kit.
Please note that non-magnetic does NOT mean it is a crappy material, and either way is completely safe.
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