What are the current rules for renewing the O multi marriage visa in Thailand, and is the long-term tourist visa a better option?

Try a repatriation flight but go through embassy

What airports can you transit through to get to Vancouver?

As Joe has said, the STV does not yet exist and may never see the light of day. If it ever does become law in its current concept form there would be 3 Charter flight per week with no more than 100 people each flying from somewhere in the world to BKK. I would assume that zero charters would be from Canada

I Canadian as well and surely never expect to get to Thailand via this method

This new visa is not remotely Official Yet. The Thai Cabinet only discussed it as an Idea. No official action by the Thai Govt. or Thai Immigration yet. No rules - No details available yet

Are you Muslim, Mormon?😂

Multi marriage? How many wives do you have? I've found from experience that one was about one too many! 🤣

After you get your type O 90 day visa, just like before, you can apply for a one year extension, if you meet the financial requirement of at least bt400,000 in a Thai bank account in your name only, or bt40k minimum coming into your Thai bank account from overseas every month for the last year. For you the bt400k option would be the easiest, if you have the money, and it doesn't matter where it comes from. It just has to be in your account for at least 2 months before you apply. There are a bunch of other documents that are not hard to get, as long as you can meet the financial requirement. Immigration will not extend your visa for another 90 days inside Thailand. They want you to get the correct one year extension after you get here, but, they have been allowing people to get a 60 day extension based on visiting family, but not sure if this might change after this month ends. It probably won't so five months instead of six, and I've heard one person that extended it twice this way, but can't confirm that. It is best to just get the one year extension.

There's a lot of hoops to jump through for the STV there making it harder everyday ,check with the Embassy there and see if you can come