Yeah, that's pretty poor. FWIW you can reconnect to the NBN in a few hours (if not minutes). The hard bit is getting connected the first time.
I would suggest you grab a Launtel plan as they do day to day plans (i.e. switch speeds every day, including to 0 which means you pay nothing for that day. Bump it to 100/40 on days you're doing video processing). Or you could use Mate. They have a 30 day money back option so that would make it free until you left the country.