I use a kill cone, but instead of making small cuts, I use a string to pull down the chickens head so the neck is exposed and i have a larger surface to aim at. Then one good whack with a razor sharp cleaver. Head falls, body stays on the cone with the feet wrapped so it doesnt beat move much...
Upside down traffic cone. The blood will rush to the head and theyll pass out from the blood pressure. May take a few minutes. Then a quick slit and theyll bleed out very fast. There will be death throws which is the chicken just jerking a bit which is just reactions. It wont feel anything.