Hopefully, the OP's Australian bank will accept whatever his local law office has provided.
NatWest offshore (UK) started this KYC (know your customer) due diligence malarkey well over ten years ago, and they similarly listed legal and professional entities that do not exist in Thailand as the only persons apart from 'visiting your local branch'. Thai utility bills and drivers licences were also unacceptable as they weren't in English (honestly!) and they would only accept a translation that had been notarised by the British Embassy... who don't do that. They also insisted that the Consular officer at the British Embassy had to countersign the bank's questionnaire...and they don't do that either. Paperwork from the Thai Ministry of Foreign Affairs maybe?...not a chance.
Ultimately, it took them about eight years to facilitate KYC for their customers who do not reside in the UK. That was via their app and was a nightmare as it wanted a photo of your passport (not a scan or digital image) but a photo taken by their app. Every attempt was rejected until someone at their end worked out that most passport photo and biometric pages have all sorts of imagery and shiny bits that are part of making sure that any photo is sufficiently 'marked' so that it can be identified as only a photo and thus cannot be used fraudulently.
I haven't heard from them for about two years, but they never ever send a message or email to confirm that all boxes are checked, and it is case closed. Just the open-ended and menacing, "If we need anything further, we will be in touch."
Good luck!