That would be interesting, but the only way you'd probably get APs to participate is to offer some type of AP discount (like at the dining locations) for the popcorn. Otherwise, I would guess a large number of APs wouldn't want to bother fishing out their APs to be scanned if there was no benefit per se.
Yeah, I'm not sure what to make of the Alien AP bucket "experiment". The buckets sold really fast, but I wonder how many made it back to the parks for refills. They aren't the easiest shape to carry and clean and I was worried about breaking off his little antenna when I brought it back to get refilled. I honestly think it makes more sense for the AP buckets to be the round ones that are fairly sturdy.