The only way I could see the Chinese regime being dismantled from the outside is through a concerted long-term effort to reposition the direction of international trade.
If the major powers which make up the bulk of China's export markets were to coordinate with one another in this regard, then I could see such an effort working, but it would have to make economic sense in order to be sustainable in the long-term.
The most logical approach would probably be for the broader international community to forge closer economic ties with India, since India is China's most obvious competitor: the countries have similar population sizes, both are rapidly industrializing, and they both have economies which are largely centered around production. If the world was to offer economic aid to India, along with economic incentives for companies to relocate there, then this would be step one.
Step two would be to increase tariffs on Chinese exports in order to make Indian exports more competitive, and then preferably use whatever revenue derived from these tariffs to further subsidize Indian manufacturing. This would have to be done gradually, in order to minimize damage to the global economy, but once the policy is firmly in motion, the world would be well positioned to proceed to step three.
Step three would be to put diplomatic pressure on China: continue to facilitate the reorientation of global manufacturing from China to India, ramping it up when needed, until China agrees to implement comprehensive political reforms. If you can succeed in making it a clear choice between prosperity and the CCP, then the CCP is history.
Do whatever it takes to further the spread of Christianity.
You think I'm joking. I'm not. It wouldn't destroy the country in the sense of a body count, but it would eventually collapse the power structures and turn it into something other than the PRC.
The last time Christianity tried to assert itself in China, the Christians got BTFO.