"How will the Chinese Diaspora react?"
Look at Thailand, Singapore, and other parts of asia with large-ish numbers of Chinese.
John is correct, that if China is "the bad guy" then they will not take positions opposed to "the non-Chinese" side.
The Chinese diaspora takes "control" of a region by business dominance. They can't do that in large western non-asian countries (regions).
If they (the diaspora in aggregate) see China (proper) as losing influence, and wronged, they will work covertly to weaken China's adversaries.
Ethnic minorities (of the supremacist variety) attempt to incrementally take power by bloc-voting in a racial separatist manner. Once they hold a certain minimum of the polity (percentage of the population) and a certain minimum of administrative/legislative power, they vote themselves (and their adversaries) into a "one party state", which forces their "adversaries" into the countryside.
Then a resentment fueled generational crisis (and eventual crisis war) comes along, and those who are the traditional constituents of "the nation" slaughter any "separatists" they can lay their hands on,.. and once that blood is tasted, the thirst grows exponentially with time, setting the resentful nations to war with each other, until... well, you know.
The primary sign of the "turn" toward the downfall of the separatists is when the youth (the "millenials") flip their "theology" from SJWarriorism to nationalism.
And I'm not saying that that "turn" is a bad thing! Nationalism is infinitely more desirable than SJWarriorism, but when that flip happens, and SJWarriorism starts losing large numbers of "adherents", the course is set for war within 2 to 4 years, but not likely LESS than 2 years, because it takes 2 years, or two "Christmases, Spring Breaks and Summer Concert Rallies", (at least) to fully energize the young nationalists.
Aloha nui guys.
<shaka!>