Recently changed. You still have to pay in advance 8,000 baht for the 3 RT-PCR tests but you do the booking yourself at a website and the hotel is not involved. You do need the tests prebooked to get the CoE still.
Cool about the OX visa, don't know much about them.
I would re-approach the Thai consulate and ask specifically if you get the Non-OX visa from them whether they will sell a Non-O (dependent) visa to your wife. That would be the easiest way forward. Explain what you are trying to do and ask them the best way to accomplish that (you on a non-OX and your wife piggy-backing off that visa as your spouse).
Second best is getting a Tourist Visa (60 days) for your wife or even settle for visa-exempt entry (45 days) and you don't have to even get a visa.
Stay away from the STV visa. It is definitely and absolutely not convertible to anything else in Thailand. It was never a good deal and is on its way to a timely natural death anyway.
To go into the reason that I say better for your wife to come to Thailand with a Non-O visa herself is that it's not really clear to me whether she can get a Non-O visa in Thailand for the specific purpose of getting an extension of stay for reason of being a dependent. You can get a Non-O visa in Thailand, BUT there seems to be some troubling wording about that the Non-O visa needs to come from outside Thailand for purpose of a dependent visa.
Finally, I would also contact the Phuket Immigration Volunteers (great group, very knowledgable and helpful) by email about how exactly to do what you are trying to do -- get your wife in a position to piggyback off your visa and they may have good advice.
Yes, your wife qualifies for a dependent visa/extension based on your visa/extension. You will need to ask your Thai embassy/Phuket Immigration the best way to do that. In general if possible, it would be desirable to get your wife a Non-O visa (dependent) from your Thai embassy. It may also be possible for your wife to arrive in Thailand on a visa-exempt entry or Tourist Visa and then apply for a Non-O dependent visa inside of Thailand.
The problem you will run into is that Thai Embassies and Thai Immigration don't seem to have a lot of mutual understanding of what and how the other party does things. Asking a Thai embassy about how extensions of stay work in Thailand is fruitless as they don't really know. Vice versa with Thai immigration and visas sold outside of Thailand.
Yes, other people have reported the same. For some reason a long delay on getting confirmation emails. Possibly why the refresh button trick when getting the email already in use error message worked.
Yes, well we should know the drill by now. Initially, the site is usually overwhelmed and becomes unavailable. Some people are getting in. There was a data leak early on which was fixed at about 11:40 AM. The usual rocky start. If it's down for you now, try checking it later.