Monk needs nothing new. Sure, something to fit into the sub-weapon slot to give small stat bonus would be nice, but Monk doesn't need an ability to tank. Counterstance has always worked fine regardless of the Defense penalties, but back in the day...we just subbed Ninja anyways. Some still do, even in Abyssea, but that's more for Yellow proc.

The point of the matter is Monk is fine with their current abilities. If you are wanting to enhance it's defensive that much, all you need are the enhancements to Guard rate really.

So as far as Monk ideas go...Wristwraps and Guarding rate adjustments is all that needs work.