Berlin_Freeper,- I’d like to see something like this available but to tell you , sailors perfected this concept many years ago. You need a CO2 fire extinguisher about the size of a scuba tank with the funnel end discharge. Place a beer on the deck cover with the funnel end and discharge the CO2. Instant cold beer.....only costs about $12 to cool each can...
In the Nam we used to wrap a beer with a rag soaked in MOGAS. It evaporates quickly and cools the beer pretty fast, but you gotta develop a taste for MOGAS.