Personally I think we should experiment with exploding hats. That is, headgear holding shaped charges. Destroying the brain in microseconds would be more painless than destroying the heart. Messier though.
Why bother with the headgear? From the conclusion of an old movie; insert a fragmentation grenade in the inmate’s mouth, pull the pin and step behind the blast shield. Quick, cheaper, but still messy.
Guillotine-—rapid head severing. Quick neat cut and less gore—just bloody. Sow the head back on later for open casket viewing if necessary.
Zero chance of painful lingering on.
The Muzzies have a good way to do this. Strap explosives to the convicted. Step away and then press the button. Should be a quick death and maybe the deceased can meet Allah on his way to Hades.
“Personally I think we should experiment with exploding hats.....”
You made my day! :)