@Sho***
, I would say you could go to the thai consulate in Savannakhet with just the marriage certificates, your wife's thai i/d card and her house book listing and get a year-long, multi-entry Non-O visa based on marriage for 5000baht. They do NOT require any proof of funds at all.
That visa would give you 90 days then you exit/re-enter the country to get another 90 day stamp. You do that for the whole year.