Quote... Such a procedure would mean these adjustments need to be backed out every time the plug is opened, then repeated when the plug is closed. I think that is highly unlikely.
Every time the plug is opened...? The plug is not intended to ever be opened, unless some new wiring or other service is required in that space. It is designed to be permanent for the lifetime of the airframe.
The differential pressure will cause a total force on the plug of several tons, so it has to be restrained be each of the 12 pads. Any outward deflection of the door will result in a leaky lip-seal.
I know of one way in which these 12 Pads could be modified, to make a more secure structure, but I have no wish to help design anything for Boeing.