You have to bundle enmity bonuses with Shield Oath, because OT PLD will destroy a MT if they get more enmity on their main DPS combo in 50-cap content. The only useful arrangement that wouldn't be fighting for threat constantly is PLD/PLD.
The other suggestions, I don't mind so much. Divine Veil I can't comment on, but its description doesn't look that impressive for how long its CD is. Sheltron should give you one guaranteed block of whatever the next incoming damage is, irrespective of whether it gives you a Swipe proc or not.