All currently available approaches have this problem. Collecting your camera phone at the counter and giving it back to you after is the only solution I can see; IE: a policy against taking cameras of any kind to the booth. Since the booths aren't actually booths anymore, they're generally in the open, this is less of an issue, I suspect -- it would be obvious if you had a phone or camera out.
Loved your riff, though. :-)
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