yes I asked about transferring my account too and they did not mention it to me either, but afterwards I thought it might solve the problem, so I called again and they confirmed it would (a bit infuriating they don't mention it).
Definitely get this set up, as I said it's really simple and I used it today, it's as quick and simple as using a card.
I also successfully extended my stay by 12 months based on retirement at a new location and the bank in Sriracha gave me the evidence required in less than 10 minutes.
You can book a cheap flight to a neighbouring country for very little money to meet the requirements. It's your airline that might insist on this not immigration.
I agree with others about getting married in Canada instead, it's not that easy in Thailand, but if you decide to do it I would recommend using an agent for that.
The most difficult part of the visa process is definitely getting a bank account opened, so do that as soon as possible. Bangkok Bank was the only one that would open for me and they used to insist on buying an insurance policy at the same time. The rest of the visa process is straightforward, just a case of filling out a couple of forms and going to the office at the right times. I wouldn't rush into buying a property, there are lots available, so rent first and check you are happy in the area. Good luck and enjoy.