Yep definately recommend Boost! Has really good rates and data allowances. I live here and use Boost prepaid as my main phone. You can get 365 day prepaids for $200!
I use NAB and I'm not even sure it has 2FA of any kind? Maybe I just haven't looked lately...but they definately haven't pushed it on me.
Oh for sure, no way we should spend $7b, but we could half-arse it given the late notice. You know, the WA way!