> As for Chinese domestic human rights, the thing is doing coups etc. as was done so many times in i.e. the Middle East and Latin America won't lead to a better outcome because a coup is a forceful, violent and sudden, unnatural event

There is a political theory that any transition from a repressive to an open society involves going through a risky zone of instability:

https://en.wikipedia.org/wiki/The_J_Curve_(book)

Now if you consider that this involves a country of 1.5B people, and take into account past experience with radical political changes (e.g. the Cultural Revolution), it seems that even for the most enlightened political leadership, both domestic and foreign, there may not be any easy answers how to proceed.