It can be done if you have a Thai bank account and 800k in it but some Immigration Offices will not do this conversion so you need to say where you will be doing this

If it's not your first report you can do it online up to 7 days before the due date. You can report in person up to day days "late"

Yes, anything such as what you listed with your name and address will do. You have a visa so the recent announcements regarding border bounces does not apply if you have a valid visa such as a METV.

@Kevin **********

It may not be if Malaysia is visa-free for the OP but Cambodia is not

@Ning *****

In theory yes but some Immigration Offices will not issue the 60 day Visit Thai Family extension on a tourism entry stamp and others will only issue this if the 30 day tourism extension is taken first. The answer is the OP qualifies for a Non-O marriage visa which gives the required 90 days on entry so Immigratrion will be pushing more in this direction now.

@Wannikea ********

If the balance is not 800k then proof of regular income in excess of 65k can be used usually with statements for 3 months

Do you want specific insurance for your visa application (such as a Non-OA) or insurance for your stay in Thailand?

@Arvid **********

Will you get a 30 day extension on a land border Visa Exempt entry? I've not seen the official announcement that was due today. What you could do is take the 60 day "Visit Thai Family Extension" before you border bounce so that you don't need to extend your entry stamp to get your 6 months.

Maybe give more information regarding the type of course he would be doing

@Glenn *********

Try messaging the RTE London on Facebook which I have done in the past and got my visa hours later. Give your name, passport number, application Request Number etc. when communicating.