Graduate and head back to Thailand
I think you are on the right track. FWIW, after graduation, you could try and get on with some of the LCC's in Thailand and get your experience. You'll upgrade within 3-5 years and then you can try to get on with Thai Airways. Living expenses in Thailand are not to bad and you can live comfortably on your salary. I would start getting your CV together and start sending out 6 months before graduation. Read the responses here and weigh with a grain of salt. You need to come to a decision that fits you. Good Luck