Just massive boycott of all Chinese stuff (which has quality problems all of its own) would be a good step.
"Good point, but don't forget about Japan and South Korea"
I don't think it a good idea of nuclearize Japan and others. don't you remember what Japan has done 50 years ago? haven't you realize their aggressiveness. I don't think they have changed fundamentally. 50-year is really short for a change like this.
Its a shame the US was opposed to Taiwan's nuclear program (THANKS CARTER) and look where we are today. The US under Ronald Reagan did have nuclear missiles stationed in Taiwan, mostly 9 megaton versions of the Pershing but those were removed when Ronald Reagan was out of office. A nuclear-armed Taiwan means a peaceful asia. With both China and Korea having nuclear arms, Taiwan must arm itself witn nuclear weapons, even if it does come at the cost of US support (as the US "officially" threatens).
Of course Taiwan probebly already has the bomb. More on that here.
We can make mainland China explode into a revolution at a time of our choosing. Stroke of a pen, as you say - trade sanctions. Too many people in mainland China know too much to be sent back to the farm...
The only defensive A weapons are in our hands, not in those of the Japanese and certainly not under Korean control. To put nukes into Taiwan would be the last straw that would break Chicom restraint and war would result. Massive tariffs on Chicom goods would hasten, not deter, Chinese attacks upon us. That's just what triggered the Japanese attacks in the whole Pacific rim in 1941. We cut off their supplies of oil and steel and bam! here came Pearl Harbor and four years of war.