What to do in a situation like this as a dead header on company metal or otherwise as a no rev on any company?

I know we all have had an experience while non rev or jumpseating and you get placed in that last middle seat on the plane and of course it’s next to some massive ogre spilling into your seat. I recently endured a 5hr red eye with a giant Samoan that had the armrest swallowed by his body. I pretty much had no recourse since I was getting a free ride but it was infuriating. As a paying customer I would have complained but even then it probably would end in the airline offering to reaccommodate me and not the ogre on another flight.