Why bother? Visa exemption is 45 days now and can be extended for another 30 days, totaling 75 days. TR visa is a hassle and costs money and only gives you 15 days more.
Why would you assume I have no knowledge? Suit yourself, „friend“. And yes, I extensively visited Thailand several times despite having had plenty covid extensions. Good day to you.
Will they? Passports do not get stamped in ones home country. Sure, you won’t have a Thai departure stamp to show. But for all they know or care you might already plan your next trip. Once a eVisa is issued, it is good for 90 days to enter Thailand. But as I said. Just do visa exemption. TR visa hardly makes sense these days.
What nationality are you? Try getting an eVisa from your home country, if applicable. Should be easier (fully remote) than bothering with having to go to an in-person consulate appointment in a SEA country.
Am I missing something? So just get a letter from your wife then. Ideally accompanied by a (signed) copy of her Thai ID card. She can write, right? What is the agent for then?