Very well thought out Morningstar, however one ability needs to be addressed, and that is Phalanx - Phalanx was an ability that previously appeared in version 1.0 as a GLA ability which worked completely differently to your idea (in 1.0, it was an effect that would make the character automatically counterattack if the player successfully blocked an enemy's weaponskill with their shield, making it somewhat like Shield Swipe). Thus I think SE are deliberately keeping Phalanx in reserve for later use with GLA/PLD with future level cap increases, along with other 'missing' 1.0 abilities.

But other than that, your ideas are well thought out and workable to me. Good job!