The problem being solved by a 6mo minimum isn't you renting out your spot for a month every year to help make ends meet. The problem is your slightly wealthier neighbor buying a spare apartment or two in your building in order to run a pirate hotel in it all year long. Unfortunately, it's hard to prevent the latter without blocking the former...

... at least legally. I assume you could work something out for your case with people you know who are in need of a place to stay for vacation, or - at a higher risk - with second-degree connections, or even complete strangers. It's not a perfect solution but it does place the risk where it belongs - on you. You have to make absolutely sure that the guests you invite aren't causing problems, or else someone will rat you out.