Which Taiwan option would be preferable?

[TDAS04]

My long-term hope is that the U.S. "trades" Taiwan for North Korea. By that I mean that the U.S. announces that it will no longer protect Taiwan (Taiwan would then ideally become a semi-autonomous part of China), and in return, China cuts off all trade with North Korea. Hopefully, the North Korean regime would semi-peacefully collapse, the U.S. could withdraw the ~20,000 soldiers stationed in South Korea, and China and the U.S. would be much less likely to get involved in WW3.

What an atrocious and repugnant idea.