Thanks all for your responses. Looks like Bangkok Bank and Wise with the 'Funds for long term stay' box ticked is the way forward. And a potential remedy for miss-flagging. Cheers
Re passport no experience or knowledge on that, sorry
Re leaving country, yes but you will need a re-entry permit to keep the visa live. Initial 90 days then can be extended for one year anytime after 45 days
this list is from Phuket immigration yesterday. I cannot stress enough, go and speak to the right person at your local immigration office. I only got this list after 3 visits giving conflicting information.