How about using the Iranian technique.....have the noose hanging from a crane, make the guy climb a 5ft step ladder and then kick the ladder out from under him.
Or -
The other technique is to use the crane to just lift the person off the ground with the noose around their neck. That of course strangles and suffocates the person rather than breaking their neck, and takes longer to die.
That’s really what they ought to do. For one thing, the free drop ruins the rope so you can’t use it again. Why spend all that money?