I don't see an problem with a licensed vet preforming this operation. Done right, it is not cruel at all. It allows a beginner to attempt a hot while being just a tiny bit more confident. I don't fully trust the surgery however, and would still treat the animal as a hot.
That being said, Venomoids work is A+ stuff. The animals come with PIT tags that identify the animal as a venomoid, and paperwork. I know a guy who keeps some of their snakes (a few different species of cobra, a monocle and i cant remember the others... a formosa maybe?) and he puts a live mouse in every 6 months and provokes the snake into biting it, then observes the mouse for a few days. The mouse always lives, and it should with the implants put in by venomoid to prevent tissue regrowth. The snakes are treated as hots as they should be, and are never handled. They are always in a locked room along with his legit hots.
Its like saying its cruel to spay or neuter a dog. It doesn't affect the animal at all (there's absolutely no evidence that a venomoid lives a shorter life due to difficulty digesting food. Go ahead, try to find some.....) and I just don't see the problem. A resonsible reptile keeper should have the opportunity to puchase any type of snake, venomous or venomoid, as long as the animal is well taken care of. People just need to realize that you don't buy them as a pet to just play around with.