@Asger ********
, sounds like you should go get the 90 day single entry Non-O visa from Savannakhet, then get the 60 day extension on that at the immigration office and in the intervening 5 months come up with a way to either meet the proof of funds to get a year-long, multi-entry Non-O visa from the thai consulate in Penang, OR use that time to look for other visa options.
Sorry, I'm not even gonna address the "move to Lao and bounce back and forth" option. That is a topic for the LAO visa group (if there is one) not the thai visa group.