The ‘procedure’ needs two living heads and two living bodies. Or one that died within the hour.
They are going to try it. There will be a lot of horrible failures before they reveal what they have done. They will hide those failures.
One question they haven’t answered. When the ‘living’ head says that the pain is too much, the horrible mismatch between the brain’s perceptions and the body’s is too much and asks to die, what will they do? Will they be tried for murder?
You can bet your sweet bippy that this guy is going to try it.
A body, sans head, can be kept 'alive' for quite a while through artificial means....