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You should not install another vapor barrier under the drywall, this as you mentioned would give you a double vapor barrier and this is most definitely is a no no. If you did this it would trap moisture between the layers and this would lead to many problems.
You could cut pieces of tar paper and stick it over the holes apply a bead of roofing caulk to bond the two pieces together. As long as you can seal the holes you should be good to go.
Remember when buying you new insulation that it needs to be unfaced as you already have a vapor barrier.
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