Wifi. Get a mifi device, data sim and, battery pack. Will keep it going for at least 3 days depending on the size of the battery. All that said my original thought was... lots and lots of chain with microfibres to avoid scratches. Padlocks are easy to break. I was thinking along the lines of a steering wheel lock. Put the arm through the spokes and lock it. You would need the right size and shape else it wouldn't work of course.
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