personally I would do a border bounce to Myanmar ASAP before his options become even more limited and get a 30 day visa exempt stamp which can be extended to 60 day at immigration
I would strongly suggest going to Penang in Malaysia if finances allow, go and see one of the agents on Chulia St...they know exactly what you need and won't submit the paperwork on your behalf unless its all in order..there really is nothing anyone else on here can do to help you