Everyone who is put under anesthesia has a "team" in the operating room. No matter what you take they will have on standby. If you are that out of your baseline it will raise red flags to your surgeon and the procedure maybe canceled. You would have to fool the surgeon 1st and by time the anesthesiologist comes they are putting you out. The one you definitely can't fool is the anesthesiologist because they will ask you a few questions and if you are barely conscious and can't answer them, they won't medicate you. But if for some reason you can fool them, they will have monitors watching your vitals closely. They will have emergency medication on standby and can intubate you if necessary. I highly don't advise this method. It's like going inside a police station and stealing a fax machine and trying to walk out..it won't happen.