Bertrand is 30 years old. Too old for England, too old to go to a better club. Probably very well settled family life due to how long he's been here. His best option is to stay here and be first choice LB. He's not stupid either and will know this.
FA regulations state that the width or diameter of the goal posts and crossbar shall not be less than 4 inches (10.16 cm) nor more than 5 inches (12.7 cm).
For me the only change required is to stop the armpit thing and use the players feet as a measure. And maybe make it so if the red and blue lines are touching - it means the players are level.