Wylie Pfaff, many Amphurs say you need to be married, but that is, in fact, incorrect. I read a thread on another expat platform where a guy got his girlfriend to contact the ombudsman, and they forced his local Amphur to issue his yellow book and pink ID card.
I've never heard of a provisional passport. However, you must have your old passport with you, as the DTV will have that passport number. You can attend any immigration office and have the DTV updated with your new passport number. I had to do that with my Non-O
I know the rejection says wrong passport type, but you stated broker accounts for the funds, and there have been many reports where these are not accepted. The funds need to be in your personal bank account.
If you are thinking of a retirement visa then simply get non-o immigration visa based on retirement while you are in the UK. There is no compulsory insurance requirement
Currently, if you stay here more than 180 days in any calendar year, then you are deemed a tax resident. It has nothing to do with having a bank account. However, you only have a tax liability here if you bring onshore funds that have not been taxed under a double taxation agreement. Most countries have a double taxation agreement with Thailand, and therefore, most people do not have a tax liability. At the moment, a tax return is only required if you have a tax liability and not just because you resided here more than 180 days.