My very simple thoughts on this matter:
The rivet is a conductor. We have no way knowing if the coating between the rivet & the blade is compromised or gets compromised during use. Because of that, if due to field expediency, you needed to use a scrap yard on a live wire find another way to insulate yourself & don't trust the knife. Be it making a bit of a poleaxe & lashing the handling to an insulator or something else.

Anything else and it will be a crap shoot which could lead to serious injuries. <img src="/ubbthreads/images/graemlins/frown.gif" alt="" />