Depends on the embassy from what I've seen. I showed them over the amount in my thai bank account but wanted to see the equivalent in my home country so did a transfer and was accepted
I visa on arrival be ok then just get 30 day extension loads lads do it.
There is now a DTV that's a 5 year visa that gives ypu 180 days then need to get anth 180 days each year just got that myself as I'm same sometimes I'm away for 3 month then here
I got mine though dentist treatment but wasent as easy as walk in get a check up and get a letter I've 4 different appointments for 2 implants only be done between my time here from work I had a ct scan for this operations.