The U.S. dictating to the poor backwards nations of the asian pacific will go over well.
More likely, a company setup by the family member of several U.S. politicians will receive funds from the U.S. government to aid in "transitioning" these economies to a post-plastics world. None of which will be effective and largely be like the Clinton Foundation in Haiti.
The reality is that reducing crude oil to gasoline production will remove the ability to produce plastics. As plastics become more expensive, different materials will be utilized.