For Physical conflicts one way to protect oneself is to put on armor. I think this tactic should be viable for Social and Mental Conflicts as well, but it's not as clear how one should be able to do this. An easy way is to just use magic, but I think mundanes should be able to so protect themselves as well, so I'm suggesting either a new Maneuver or Trapping for the various Mental and Social defense Skills.
Bolster Self Image
Possible Skills: Conviction, Discipline, Presence, Rapport
The character rolls against a difficulty of 2 times the Armor level they want to achieve and armor themselves against Mental or Social attacks for the scene. Any extra shifts raise the difficulty for an opponent to tear this armor down with a Maneuver.
Does that seem balanced?