If you have that visa from Singapore your DP might be able to apply for the 6 month METV from the Thai consulate/Embassy there...that is if the DP meets all the requirements for the visa
One down side I was at the airport for an hour trying to get my elite visa...I have some sketchy visas from sketchy countries due to work so I had to talk to the head of immigration at Swampy to get through...after I should them my Work orders they put it in no questions asked..:so if you’re in my predicament be prepared for that
it’s ok they get clingy though...I usually Dutch them after I’m stamped in...the fast track is the best I use it to come and go, the best part is if you forget to email them prior to your departure/arrival you still get the fast track