You certainly are interested in Sacrafice arn't ya.
Shadow Destruction with Double Sac I guess could work out. You're going to confuse alot of people with Big Blue out, though, which who knows... might work in your favor.
I think most Destros would agree, however, that Felpup's Devour Magic can help the situation out more in their favor (unless you're fighting Melee) which isn't a Destro's forte anyways.
I would say... experiment with it yourself... get FRAPS or something and make some videos and show us if it's worth doing... lol...