This is solution, first they need to Understood the system does not serve their needs.
What they could do is start using their own Community money backed by food and fruits.
Becouse If your Community grow food you can never be poor poor people you see your goverment don't care, why you use someones money who don't care about you ?
Leave your goverment currency and issue your own Community money.
And If your poor Community Grow food it means other people out of your Community need your food, so in order to get your Community food they need to obey your Community rules and they need to buy your Community money with rate that's beneficial for you.
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How exactly are you going to create a form of money that spoils in a matter of weeks or months? One of the most basic characteristics of money is that it has to be durable, not only that you want for people to create a whole new economic system for themselves, when they could just sell their produce, earn fiat this way and be done with it, remember when given the choice people will pick the easiest solution available to them, and what you are suggesting is too complex for them to implement, without mentioning that it is probably illegal in most countries around the world.
Everyone will certainly not choose a form of money that can only last a few weeks or months, because most people will collect their money so they can save for their future and this is not possible if the money cannot last long, of course people will look for it. a solution that can make it easier for them, not even make it difficult for them if they use the new system and this of course will not be implemented well, because there are too many losses that might be obtained from the new system.