Not at all crazy. This seems like a very imaginative and certainly collectible addition to the plethora of images that have appeared on the inside of Coke bottle caps over the years.
They just use a thicker holder. Here is an NGC graded version of the beer bottle cap coin: https://m.ebay.com/itm/2016-Palau-1...859522?hash=item466ddc3802:g:DOQAAOSw2gxYztIt
Darn you, @ddddd ... I was perfectly happy not spending money until you posted this... ;-) Call me crazy, but I bought a few. One to keep, one to sell at Christmas time, and one for who knows what.
You weren't kidding! Apparently, in the inventive, creative and flexible mind of the numismatic-minded, for every new problem there is a logical solution.