If you marry her through the British embassy consulate then she will have the same rights as any other British woman , when she arrives in the U.K. she will have the spouse visa and she will be able to work , I know this because I was married to a Thai woman 20 years ago .
Sorry for this bad time in your life , I have been there and I know exactly what you’re going through , it’s not nice and it’s not easy but believe me going to Thailand with no money and no profession is not the answer .
Stay where you are , keep looking for work and eventually you will find a job and you will save a little each month and when you’re in a better place, you will travel and enjoy but now is Not the right time for you .
Good luck Brother and wake up every morning smiling ,