I thought that when it comes to the Japanese carriers, you have to go through the whole private to ATPL thing anyways over about 6 months.
Not exactly, the reason it is only six months is because they will credit many items on the curriculum based on your existing ICAO license.
Not sure about the NCA info not accepting Type ratings from Taiwan, but we do have a few guys here at AJX that came from EVA and many others from China Airlines