Disclaimer: Is it possible to replicate one of the most beneficial aspects of Ochain; rate spell interruptions through shield blocks?
In short, No. Not possible. If this was the case, I would not be spending my time upgrading my own Ochain.
However, is there a superior build currently available, but not widely used or known, that will enhance a PLD's ability to cure when in desperate need of it?
I think there is. and it might look a little something like this;
Augments on dark rings - Spell Interrupt down 4% each (best I have seen)
Augment on Adaman Barb. Cure Potency +5%, spell interrupt down 4%, regen+3 (my own adaman barb.)
The little testing I have done results:
Seems to be more effective than stacking shield skill. But again, the tests I have done have been on Monitors. Not really the kind of thing you would bring a PLD.
Waste of time? Perhaps it is now. But if SE ever releases the availability of 35% more spell interrupt down, this might become popular and worthwhile.