i was a teacher in Thailand a number of years ago and it wasn't for me but this sounds like your class is actually pretty good.
I am not stranger to the edible bugs and even though I always tell people that they need to step out of their comfort zone as far as food is concerned over here in SEA, the bugs thing was something I just couldn't get past.
I do admire the fact that these kids consider them to be too tasty to resist. I think in my kindergarten there would have been people throwing up if someone at a bug. Probably lawsuits against the school as well haha.