It might be possible to create a similar set of lessons for Thai to incorporate the letters and the vowel diacritics, building on material slowly so as to introduce what can seem a very daunting alphabet in beginner-sized chunks.
I'm also doing some curriculum development for a company that does international & cross-cultural business training, and one thing that I've seen and liked is the insertion of little segments for a deeper grasp of culture, such as explaining names (construction, "normal" names, modes of address, titles), ways to relate with the culture (would it be appropriate for a Western man to shake hands with a Thai businesswoman? What about a Western woman shaking hands with a Thai businessman? Should you just wai and avoid it all together? What about good etiquette for a business meeting? Interviewing for a job? Going to a wedding?)
For what it's worth, I'm willing to back my suggestions with help. I have some experience in curriculum/materials development and have a couple TESOL certifications, so I'll put my money where my mouth is to help.
