@Colin *******
there is now the tourist visa exempt stamp again, but, it has been extended to 45 days instead of 30, to make up for your time in the quarantine hotel. But, in your case all you need to do is have your wife send you copies of your marriage certificates, both of them, a copy of her ID card, and you can get a type O 90 day visa no problem. Then you also need to get everything needed to get your certificate of entry, that includes insurance that covers at least US$100k for covid-19. A covid-19 test no later than 72 hours before you fly, and a fit to fly certificate from a doctor. These are required no matter what visa you get to enter Thailand. If you currently have at least bt400,000 in a Thai bank account, in your name only, then there is no problem getting the type O marriage extension on the tourist exemption, but if you do not, then you will run into problems, as the money has to be there for at least 2 full months before you can apply, and with the exemption, you might end up a few days short. The exemption is only for 45 days, with a 15 of those in quarantine, then only one 30 day extension. July has 31 days in the month, so you could end up a few days short for the financial requirement on a visa exempt. There is also a regular 60 day single entry tourist visa now, with a 30 day extension, so you have choices,, just do not try to get the 90day STV visa, with two extensions, as it is very specific that you can not change it to anything else in Thailand.