Try Siam Land Flying Co. on google, thats one they fly the 350 and they were hiring not to long ago, theres another I found too but its not coming up lemme look some more.
As an expat you'll need 2500TT and the time on type with the rating since the government is strict about the hiring of expats. Its tough to get in, but I don't know of anyone that ever regretted living in Thailand!
