That's very smart and might end my quest for a truly quiet bedroom fridge, if it really only runs two minutes in an hour. (Light fridges marketed as "quiet" just produce near-constant annoying fan noise, quietly.)
Have you looked at hotel minibar fridges? They're generally pretty quiet.
It really works, and if you fill half the space with water then it'll only need to run once or twice a week (assuming you don't open the lid often)