I really feel like for the PLD rework they only really need to change all the spells into oGCDs, including Clemency. Blades however, can stay GCD, with Confiteor serving as the starting button, with each Blade after being the same button being pressed again, like the Gnashing Fang combo. This gives PLD a burst and doesn't require them to remove any buttons, just change what they do. That's assuming they want to avoid butchering the job, unlike what they did to DRK.