Hello CR, There is a dedicated Thai B&W goup called B&W rhapsodies group. They have their own website,
www.bwfoto.net, the webmaster is K.Soranai who is an enthuasist for black&white photo processing. The website also contains a very nice gallery of traditional Thai B&W photos, some of them were color painted! K.Soranai takes B&W photo processing as his serious pastime but he also can be hired for B&W film processing and printing, although his main job is an engineering and an enterpreneur! So do not expect any cheap work. He also is a camera collector, from P/S Leica to large format ones. Mostly, he shot with his M Leicas. I am a member of his B&W group and do my own processing and printing but I am still in the novice stage. Sadly, if you cannot read Thai since most of the members are Thais and they communicate in their own language. If you need any more info you can have some Thai translate the website content for you.