It is an auto generated e mail, not a snarky response. The passport number was wrong and application rejected before anything else was even considered. Move on, resubmit and make the 80 page resume useful.

A bank statement maybe to suffice? London embassy does ask for a proof of address.

Much simpler to apply for non/o in home country, enter Thailand with the visa , open the bank account and apply for extension within 3 months

Good for you. Hope you realised the gain so you can show it as instant accessible cash to the embassy. Seasoned for 3 months, some require 6. You need much less that your amazing earnings.

Valid for 180 days but required to report at 90 if you are staying so long

Why would you pay with QR Thai code if you can pay with the card which is purchase fee free (wise, monzo etc…). Converting foreign currency is expensive (whether cash exchange or wise transfer onto a thai account) … keep it for where they do not take foreign cards or charge extra for using them.

My condo in BKK is of the rental of an equivalent unit in suburban London. Similar the capital value ratio. Food eating only organic (cooked at home) is same price as London. Transport at th of equivalent in London. I am sure the value ratio would be very different for different parts of US but compared to London the Bangkok is at about 400% -500% lifestyle ratio.

Just go with the amount as per your embassy website as they will make their decision based on the € required balance as per italian bank account and not a thai bank account (we must show at 800,000 for yearly extensions).

Much easier to get non-o in your home country before you arrive. In London only took few days. I tried the same as your plans but instead returned, organised the non-o and went back to Thailand.