you need to do a little better research. Go to Laos, apply for visa via evisa for non-o based on over 50. Once you get visa, reenter the kingdom on your non-o. Then go open a bank account. At the end of your 90 day non-o visa, and having seasoned your 800k for 2 months, you can apply for a 12 month extension of stay.
You needed to apply for your non-o while you were in the states. It will be very expensive to convert your exempt stamp to a non-o and will require an agent to open a bank account for you.
Make photo copies of your old passport including all stamp pages. Once you receive your new passport, go to immigration and have them transfer the stamp. If you've never activated your LTR (entered using that visa) then I'm not sure the visa would be valid against a different passport number. But you could make you case with the IO upon entry...