No, bury him where only his head is shown and make sure it by a nest of fire ants, slow and methodical.
Or put him in a container and fill it with beetles, they will eat and strip the body very fast and make sure he is alive when you do it.
Your method just isn’t vicious enough.
So what you describe is exactly the experiments he did to torture beagles. He would cage their heads and introduce biting flies into the mesh cage. The biting flies were infected with various diseases. Really nasty diseases.