First off, there has to be a clear division of responsibilities. If you don't want to be the "chickens guy", there has to be some way to incentivize and cleanly hand off all the chickens chores. If everyone is responsible, no one is.
The first thing that comes to my mind is a ticketing system with a time-dependent bounty attached. The chickens investors establish the chicken requirements, such as "ensure that all chickens are inside the coop and secure it against predators before civil twilight". That ticket repeats daily, with a bounty rising until the deadline, at which time the bounty freezes at the maximum, and the nag program starts messaging people to go do the task before a raccoon shows up. When you do the task, you press a button, which attaches a timestamped photo of you to the ticket log, which is freely auditable by the stakeholders.
The mobile farm app is continuously updated with outstanding chore tickets.
The investors pay the bounties, so it would behoove them to more often do the chores attached to the farm products for which they are larger stakeholders. If someone would prefer to skip a chore to bring in some outside income, they will essentially be paying someone else out of that to pick up the farm slack. If everyone winds up doing that, there might be professional farmhands available as the fallback, so the bounties would have to reflect what it actually costs a farming professional to do the tasks.
I am a software worker because I am an essentially lazy person, so if I were involved, it is very likely that I would invest heavily in a perennial polyculture plot, and spend much of my time researching robotic harvester designs and preservation methods for uncommon fruits and vegetables. For instance, how do you get a pawpaw off the tree and to the customer before it rots? How many walnut trees can you use in your canopy before you start shading out your persimmons? How cold can a trifolate orange tree get before you lose the fruit? Would people eat linden leaf salads? How do I encourage permanently resident pollinators?
The only people seriously looking at these questions, if anyone, would be Ag-Sci professors and their grad students. And their research might not necessarily have practical utility when it comes to making a profit as a part-time farmer.
And, of course, it goes without saying that we would have to jailbreak the Deere and come up with some open source firmware.