Hah, nice try China.
For real though, you'd have to brutally murder everyone in power in the CCP, at least the figureheads, then setup a puppet dictator or party to gradually turn it into a democracy. You could reveal things the CCP has done and tried to cover up to turn Chinese opinion against them, but that would be too slow as the Chinese are fiercely loyal and nationalist.
It seems near impossible at this point, unless the CCP makes the mistake that the Soviet Union did, of having the wrong types of leaders as times change.