Yes, of course it's an option.
Things you should factor in are the cost of keeping the aeroplane somewhere, putting fuel in it (I presume that's not covered), and what penalty he's going to charge you when the weather's bad and you don't do your 30 hours that month.
I once tried to convince someone to lease a plane to me and, when I didn't fly the minimum number of hours, to charge me the profit he'd lost rather than the full flying rate for the hours missing. He thought that was a very novel idea but perhaps it was too simple for him 'cos I don't think he really understood it. I've never understood why that sort of idea isn't commonplace, including when renting for a minimum flying requirement per day.
Your costs of keeping the plane somewhere will be divided if you can get some other people to join you in your scheme.