From my understanding, that is essentially what you are advocating, just with a different landmass. To me, it seems incredibly colonialist.
Is this colonialism? It’s certainly a cultural change.
The mixing of people and ideas through trade and migration has resulted in the fastest decline in mortality and poverty in human history. Cultures open to new ideas have benefitted the most.
Foreign/multinational organizations coming to dictate to the "natives" even how to deficate, for "their own good"? Sounds like it.
Colonialism is not just about "bad intentions". There were colonialists with "good intentions" too. They also thought they were doing "god's work", building railroads, teaching the brute natives how to live, and so on. The "white man's burden" they called it.
In the case of Japan, Americans threatened and even bombed them (in the 19th century) to teach them how they should live: to force them open their borders to western trade. The same entitlement apparently never stopped.