I don't give that. I don't give it a bit. Especially if holes can be poked in every new method as these ghouls come up with it
There is no reason to acquiesce to an inevitability that it will occur just because shitstains keep trying to execute people. I remember it was decades wasn't a single execution in The United States.
"what is the least bad way to do it?”
There isn't one, and every single method should be objected to as it comes up.