The banked money to meet the financial requirement for a one-year extension for retirement doesn't have to be international transfers. Just needs to meet the seasoning period for 2 months prior to the application.
International transfer is only for the initial in-country visa application for retirement.
, royal thai embassies and consulate-generals have holiday schedule for each. It may vary even in the same country. Check their website or sns for their holiday calendar.
, Non-O initial visa for retirement/being over 50 also has the same financial requirements as Non-OA (banked 800K baht equivalent or 65K baht equivalent monthly). Most of the other Non-O initial visas have their own financial requirements, too.
No, you cannot. At Chaengwattna, you must have 15 days or more remaining with your current stamp (visa-exempt or tourist visa). Now that you don't have enough days remaining, you must apply for a 30-day tourist extension first at the IT Square Laksi Plaza office, and then you are eligible to apply for an initial in-country visa at the Chaengwattana office. You need to check with them whether you can apply for a tourist extension and an initial in-country visa on the same day or not, in your case.
Jomtien standard accepts your extension application when you have 30 days or less with your stamp, but will accept it earlier if you provide a reason on your side.