I'm a cocoa farmer/chocolate maker, launching a chocolate business soon. I purchase some cocoa from the local farmers too, but would like to increase this number in the future but would like to put a model in place to build my business but also give the farmers a level of ownership instead of building a typical co-operative.
It sounds like you are talking about an ESOP (Employee Stock Option Program). Some notable companies to offer such incentives include GoDaddy, Nordstrom, Intuit, and Whole Foods Market.
Because the farmers you want to reward are not your employees, it may be tricky to structure an ESOP.
I am interested in knowing more about why you are opposed to a "traditional co-op" or profit sharing.