You should also sanitize the vanilla beans somehow(let them sit in vodka for some time?), because I think they can contain some bacteria if you want to throw them in to the secondary.
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I would make a vodka extract and add it prior to bottling - u can add it, taste it, and add it again until you'll find just the right spot.Just make sure you don't over do it, happened to me when adding spices to a stout, drinkable but not the best.
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