Rodd Miller The O-A Visa is a long stay multiple entry visa. Nothing has changed about this visa. Earlier in the year there’re was much discussion about a health insurance requirement but it has never come to pass. There are a bunch of requirements to get it but it is what you want to get if you are over 50 years old.
You could try to get an O-A visa from the US. However you cannot work inside Thailand for the one year term of the visa. Look at the requirements on the Los Angeles Thai Consulate website.
Also any attempt to come now, in this age of stricter enforcement of Immigration laws, is going to depend on your previous travel history to Thailand. You will have to tells us more about your history to get useful advice about short term entry.
You can stay long term based on being married to a Thai. You can wait two years and come using an O-A visa. Look at the Thai Consulate websites for the several requirements for an O-A visa. Search this group for the requirements for stay based on being married to a Thai.
Long term stays for people under 50 years of age are difficult. I guess I would add that you shouldn’t abuse tourist and education visas.
Kasikorn once told me they could do this but that it would cost a couple of hundred baht and take two weeks. That was six months ago when I asked this and it may depend on your branch. I think it is called a credit advice . Good luck.