Update on my original question: I just got my booster shot yesterday at the local 衛生所 in Su’ao Yilan. It turned out they needed the dates and vaccine batch numbers of the first two shots in order to book me up in the local system for the third.
I am still in the process of getting my ARC, but I had an ARC number already since it’s not the first time I come to Taiwan on a resident’s (spouse) visa. They took the number from my Taiwan health insurance card (gotten during a previous trip, useless for now till I spend 180 days in Taiwan).
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