Get a retirement Visa. You are over 50. It is a lot easier. If you have 800,000 baht you can do it or you can use an Agent if you don’t. A marriage Visa is 400,000 baht but your wife will have control of you. I have had both marriage and retirement Visas
The K-1 fiancé(e) visa allows a foreign citizen to enter the United States to marry a U.S. citizen. It's a nonimmigrant visa that provides a temporary stay for up to 90 days during which time the couple must marry. After marriage, the foreign spouse can apply for a gre
You’ll need to show you have funds to support her, get a fiance Visa and marry her in 90 days. Other than that it is virtually impossible unless she owns property, has a real job, a track record of steady employment and other anchors that will require her return.