Currently it is not possible, from Taiwan’s perspective, for APRC to be tax resident in Taiwan if staying less than 183 days. There is another thread trying to change this.
You can have the best of both worlds if you have your businesses and investments offshore. For example the US. They will treat you as tax resident of Taiwan if your permanent home is here, so US won’t tax you on things like salary, capital gains etc. It is actually better if the TW tax bureau considers you a non resident in this case since they won’t tax your foreign/worldwide earnings if not sourced here.