Taiwan has its own store, fully independent of the Hong Kong or Japan stores. You could set up separate users with fake addresses to see what is offered in those stores and check out their demos and videos but you likely would not be able to actually buy anything- the stores are set up to not take credit card payments from cards registered outside their service area. Due to location you are going to have to make do with what is offered in the Taiwan store when it comes to purchased downloads such as PSP games and original titles such as flOw.