Taiwan’s best defense would be to send every one of their Army conscripts home with their rifle when their service is over.
Like the Swiss, bring them back for a long weekend every year or so for training and updating.
Having 1 million armed Taiwanese is a better guarantee of their future independence than relying on expensive American jets and the whims of American politicians.
Better yet would be a few tactcal sized nukes aimed at the Three Gorges dam.