Wouldn't speccing into Affliction - the arguably superior spec for the encounter - solve all of your problems? Both specs are haste-heavy so you wouldn't have to do much min/maxing unless you felt it was totally necessary.
Wouldn't a proper Affliction spec be preferable to a one-encounter-only-applicable Destruction spec? Do you not have moonkins that are DPSing/multidotting and helping you out through
http://www.wowhead.com/spell=48506 ?
To answer your question though, while it would probably work it's very likely to end up as a DPS loss to you. And I base that on nothing more than my own "common sense", so it's also quite possible that I'm wrong