As corrupt as a country like thailand is you run the risk of losing a significant proportion of this under a miriad of “legal “ways”
There are a number of ways to legally bring money in
go to an thai expat page and get some advice
They may even arrest you at the airport (on a flimsy made
up reason) just to separate you from your stash and make it vanish
But a fool and thier money are soon parted
I dont mean to be rude but you canot be serious!