Flying is already so incredibly torturously uncomfortable for me that the very slight risk of injury or death is worse it for the increased comfort of not having a seatbelt on.
Since I don't get upset when other people do things for their own comfort that make me extremely slightly less safe to a similar extent, the Golden Rule school of ethics suggests: "yes".
I wonder if your head would actually hit the cabin ceiling though because of the centrifugal force. The plane might have flipped too quickly for that to happen
