Gimble Stop
The crewman has to be 75kgs. This is to prevent climbing right hand turns.
There are no CASA requirements for flight and duty time restrictions for crewmen.
There are no CASA requirements for educational standards for crewmen.
Even the 75kgs is optional. But it makes the math easy.
Your fruit pickers should do ok provided they don’t touch anything.
Boy! Are you in for a world of hurt. Good luck. I’d be sticking with the light singles if I were you.