A spaceship technician landed (crashed?) on a pristine planet (strong Polynesian resemblance) where a tribe of humans lives in harmony with nature, isolated from predatory capitalist humanity, colonising more and more space.
He decides to train them how to resist against expected land grab and corporate invasion. Dies before first space mission arrives, leaving detailed handwritten plan.
The whole plot is about the -- eventually successful -- resistance, run non-violent and legally-supported way.
Possible title "X's Planet" or "X's Plan" -- X being the name of the said spaceman.