I doubt anyone will agree with me but if there are no outlets on this wall and the tops and sides are sealed you will never have a problem. A couple good coats of oil based paint will make the entire wall a vapor barrier. Water vapour travels in the moving air through holes (outlets). It will not travel through firerated drywall in any capacity capable of causing harm. if you can see the base of your wall, run a bead of acoustic sealant along the sill, make sure there are no moisture paths throught the top and sides and relax. Also if there are no outlets, there is no reason (unless there is a code out there I don't know of) you couldn't vapour barrier over the firerated drywall and cover with another layer. The second layer is only going to increase your firerating.
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