One last thing
@Gee *******
, it's not getting out of thailand & into cambodia that's gonna be hard, it's getting BACK into thailand with a pile of covid 19 extensions in your passport when you hit passport control coming back in. Even with a valid Non-O visa based on marriage they will probably put you thru the wringer if you have an extensive history of covid extensions.
Have proof of funds, (20 K baht in CASH)
Have proof of lodging (letter from your wife saying you stay at xxx address)
Those are the things they will ask you for if they're gonna give you a hard time. You wouldn't need proof of onward travel because you're comin' in on a Non-Immigrant visa