Keystone suggestion

Just want to share an idea i had. There is a notable difficulty to top side of the tree to gain physical mitigation. There is a keystone that converts evasion rating to armour, what if there is another one that converts energy shield to armour? To prevent OPness these 2 should be as far away from each other as possible, Iron reflexes already is at the bottom of the tree and the side with physical mitigation deficit is on the top. This could boost life int-side based builds because you are eliminating all your energy shield to gain armour. Call it Iron brain or something idk