girl, I'm rooting for you. Do some indepth research. Go on vacation in Thailand, see how the locals live (don't get tucked into the expat retiree mindset), meet the locals and network. You deserve to explore this dream of yours. Just be prepared.
I think that's a niche you could fill. Maybe take a vacation first for at least a couple of weeks. The problem with a lot of expats here is that they live like tourists. Telling people they need at least $2500 a month to live. That is so not true. Locals live off $300 a month, if that. One could live off $500 - $700 if they live like the locals. That's actually a comfortable amount, especially if you're not into the bar scenes. Good luck to you and your husband.
I don't think your music therapy or bus driver experience will help you in Thailand BUT your holistic therapy experience could be something you can use. Thailand attracts that kind of clientele.