I agree with what's already been said. I would say no to a combination for sure. If you've thoroughly researched exit bag, and have the right supplies, it seems pretty quick, more peaceful, and higher reliability rating. And, as mentioned, SN has proven to induce vomiting, even following Stan's methods, with prescription meds. It's less likely, with Stan's exact method, but still possible to vomit. It would really suck to vomit inside your exit bag, even though highly unlikely, as the exit bag should render you unconscious quickly, before SN even starts to work. I'm going to try SN myself. But I think I'd rather do exit bag if I could ever get my hands on a tank and not get caught trying to lug that tank to a good exit location. Seems like most tanks are highly regulated now, and monstrous in size.