PLD has enough self-healing and self sustain on max Level with his whole magic rotation healing him plus a HoT on holy shiltron and intervention.
He doesn't need more free direct healing.
The clemency option is good as it is now.

With intervention he even has the strongest skill to help the MT. A other tank can take a shared buster alone, when he gets a buffed intervention.

I don't really understand why some player think that PLD need more/ different defensive tools. I think his current mitigation kit is the best and most versatile of all tanks.