Can you tell me what the setup is like with a rachet? I have several here bought for what rachets are usually used for.
The setup is simple. You buy a hookless ratchet strap. The you will use it like a zip tie on your neck, really.
It takes a lot of weight to compress the airpipe, so you will get the carotids first, so it works exactly like this tourniquet method. although this one is more safe, because the only way out of this, is if you hit the valve. However a lot of force is required to get the valve open though, as far as I know.
It's important to get good at using the valve too, since there was a report of a guy that got it stuck in his neck and he actually asked for neighbors help...
This is doable btw, i saw cases on pubmed, where a slight overweight guy managed to do it. The image is a bit disturbing, so i won't post it