You dont need soft power of 5 years. People get/got away with some weeks training or even 1 dentist appointment at some embassies.
But This is Thailand and too good to be true. Maybe they will check in some year(s) if you still have a valid reason when entering. Maybe they won't.🤷♂️
At least for extension for the extra 180 days you have to reproduce all the intitial paperwork at this moment, so that would be hard with a short course or treatment