Better yet would be a few tactcal sized nukes aimed at the Three Gorges dam.
Such a decision would have to come after a lot of very deep thought. About 75 million Chinese live downstream of the Three Gorges Dam, and an attack on that dam by Taiwan would lead to such a massive nuclear response from China that it would be more akin to nuclear saturation than nuclear warfare. While targeting the dam seems like a doable thing, the fact remains that it is a consideration that I am 100% certain Taipei would never consider due to the consequences that would follow a successful attack (even an unsuccessful attack would kill tens of thousands of people based on some published research on what a large landslide would do).