All told, what you seem to need are high altitude mountaineering gear. So, some cold weather gear, an oxygen bottle, and some ropes. Doubtless it would be a nasty ride but you'd probably survive.
The only thing left is about... the crushing risk. And radical sudden air pressure changes you may be exposed to.
Also... the difficulty of getting in and escaping while carrying all this gear.
In this heavy winter gear... you will likely stand out for sure.
Why radical, sudden pressure changes? The plane doesn't teleport to altitide, it has to fly there. A quick search led me to an airline pilots forum, where they say it generally takes 25-35 minutes to climb to cruising altitude in a 747. Doesn't seem to radical to me.