But this is an already fixed issues, no airplane crash happened recently because a chubby guy on the first seat, the average is already being used without any risk to passengers.

Again, commercial airplanes are already too safe to any of your suggestions make an actual difference, and if it could actually make a difference Europe agencies and FAA would have already emmited alerts related to this (not an imperialist issue but they are financially attached to boeing and airbus so they usually push the standards further), and a random ass company would not be the leader of this safety standard.