I am a qualified sailing instructor but live in Australia. Too far for your purposes I guess. I am however happy to do a trip to Asia to help you out if it suits you. It would entail taking on a charter boat in a suitable location and the lessons could be done on that. it would work out a bit on the rich side however if there were 3 or 4 other people needing the same thing the cost would be divided.
Think if you have enough contacts that would share a charter and I can make myself available.
Subjects we would cover.
Using paper charts & compasses
Introduction to celestial navigation (noon sites)
Anchoring, heaving to
Sail sets and reefing
Victualing, cooking, menus suitable for cruising
My websites www.discoversailingschool.com
I hope this has been helpful