Originally Posted by
Alerith
As Firon just pointed out: Aegis Boon.
You can't use it as freely as you can Second Wind, but you can get a far larger return from Aegis Boon. As far as stalling is concerned, Shield Bash and Flash do just fine for the most part, and if you are in such a dire situation, you can still Bloodbath a high damage WS like Spirit's Within. Also, if you're tanking a single target, interrupts shouldn't be an issue.
As far as shield blocking preventing interrupts, I honestly don't know for XIV. It works that way in XI, but only after a patch that finally gave PLD Shield Mastery.