✔ 最佳答案
1. See here (Under Article 17):
https://www.immigration.gov.tw/ct.asp?xItem=1083520&ctNode=30081&mp=law
2. Sorry to say - A Hong Kong resident can't be a resident by virtue of becoming a student, leaves and return.
Taiwan's definition of "僑生" has explicitly excluded Mainland, Hong Kong and Macau residents.