@Ric****
, AFAIK, none of the people from countries that get 90 day visa exempt entries (Argentina, Brazil, Chile, Peru, South Korea) can bounce out and back in at the burma borders for a new 90 day stamp .
I think the Lao border (Chiang Khong to Huay Xai) in Chiang Rai allows it (but am not sure)..
Your safest bet would be to fly.