@Su***
, seeing as you don't have enough time on your current stamp why not get the income verification notary from the US consulate, then go to a thai consulate in a neighboring country and apply for a 90 day single entry Non-Immigrant Type O visa based on being over 50.
Then you'd get stamped in for 90 days when you come back (and you'd cut TWO visits to immigrations out of the plan because you already have the Non-O visa). You'd get stamped in, wait until you have 45 days or less left on that 90 day stamp and go get the year extension at the immigration office..
That's what I'd do anyway...