i have absolutely no problem with the broomstick method for despatch, it was more the plucking, removing the neck, feet and guts/innards that i need instruction/practice on.
i've seen one of those wall mounted things that you close down on the neck, think it severs the spinal cord - but not convinced you could adequately hold the bird and operate the device.
i also googled the electric stun things, at £700, i think my broomhandle will more than suffice