This is what I was looking for with the method. Whether or not it would scar you for life is different than if it would cause the animal pain, which seems to be how this whole argument has turned in the last page (not freezing due to drawn out pain).
I suppose if we have more confirmation on that then the only decent way to cull them would be to take them to a vet.
I found a site confirming your claim:
http://fohn.net/corn-snake-pictures-facts/
And assuming their citation is accurate then euthenasia is the only option.