sorry for the delay...
yes, i'm sort of local, i spent time growing up here and have been back now for a few months. the locals have a great attitude towards foreigners. i can't think of anything specifically to look out for. as for immunizations, i really can't remember, i think i had one for encephalitus when i first moved here. TB is widespread, but things like malaria and dengue are pretty rare.
I'm not sure why KK is by invitation only. I haven't been to his school, I've only had a brief email correspondence with him. I'm hoping to get up to Ayutthaya soon to visit the Buddhaisawan school to get the low down on what's going on, but i'm not currently practicing KK. i have no disappointments about living here or any of the training i've had here.