I am sure that I am being very naive, but prior to evacuating the island, why not try some "crazy" stuff to prevent the war?
Why not officially rename the Republic of China (the current official name of Taiwan) to Taiwan, and make a big deal out of giving up any claims on China, so that the CCP saves face when making the practical decision of not invading?
Because abandoning the One China Policy would make the PRC much more likely to invade?
Does the government of Taiwan subscribe to the One China Policy? My understanding is that it does not. I would hope that they are the ones with the agency here.
The CCP sees the Taiwanese as rebel separatists, so renaming "Republic of China" to "Republic of Taiwan" would increase, not decrease, the odds of invasion by confirming their propaganda. The CCP wants the island of Taiwan itself; it doesn't care about the ROC's claims on the mainland.
I would very much like that if it works.
Re evacuation: I guess many, many people will be evacuated in case of a war. But people will be dispersed like with the Ukraine refugees.
Sad to see more and more country giving up on recognizing Taiwan as a state.