Just hang him or give him a firing squad; short and sweet.
I still think self termination should be an option for death row inmates. My friends and I during a night of imbibing adult beverages started talking about the death penalty. We wanted a way where in the eyes of the church, the condemned would be guaranteed a trip to hell. No forgiveness.
We came up with a system that was based on completing a circuit. Within the cell there are two points on the wall and two points on the floor. The condemned would have to put hands and feet on the connections. The fifth connection is for the forehead. Once the forehead makes the connection, a 50 cal bullet is fired into the head. The bullet won’t fire until all 5 connections are made.
Once the prisoner is put on death row, all he sees within his cell is that contraption. Could be days, months or years, but it is there staring him in the face until the day he is taken from his cell and executed by the state.