Isn't this just a specialised pawn shop? The more interesting thing is that the 'value' of the cheese goes up over two years so there is an incentive to purchase back the cheese, although I suspect the 'bank' sells the cheese on behalf of the farmer for a fee and writes off the loan and gives the farmer any profits.
I'm guessing a similar approach could be used for some hams but not sure if there are that many food products where there is relatively high value in very small amounts of space.