You need to show in your OZZIE bank for the initial OA in Oz....If you go for a 12 month extension based on retirement later while IN Thailand, you technically need it in a Thai bank...unless you use an agent who ''arranges' it for you.
For air BNB you need Owner ID and blue book. I saw some people who were staying in an AIR BNB who did TM30 at pattaya immigration. They just emailed the Owner.