The Lifevac is more highly rated than the Dechoker. It is also easy to purchase on Lazada.
I might get one. One time I can close to death in Thailand was choking on some stringy meat. Nobody helped despite sitting in a busy shopping centre. I had to just pull the meat out, causing quite a bit of blood loss from a tear. The restaurant owner later said he thought I was reacting to the food being too spicy. Now I've experienced people's indifference I want to be better prepared.
I've heard people, especially women, out of embarrassment from the choking, will head to the toilets, and then there will die.