Since you do not work with a hermetically sealed environment, it is totally enough to use duct tape to bridge different hoses. The goal is to have a steady stream of nitrogen which you can breathe for at least 60 minutes. Not that you need this long to die, but in cases like this, I would add 3-4 times the amount of safety, so you are clearly dead and not just a veggie in a coma.
I am Swiss and member of the other big organization which helps people die. Not because I want to die, but I think it is every persons basic right to decide, when their life should end.