Antihistamine cream works a charm. It's most effective if you put it on as soon as you notice the bite. The brand I use is Anthisan from the UK, but there's probably something similar in Thailand if you ask around
From memory, it used to be possible to get an entire villa on ASQ, then (and only then) you were allowed to use the pool. If you have extra $$ to spend and really want that pool time, I'd check if this is still an option
I have flown around the world and no airline has required me to show any vaccine certificate. I'm not sure which airlines are flying that route at the moment but have you tried a non-Australian airline? Like one of the middle Eastern ones maybe?
