When I use beans I split them, or score them and let the sit in the secondary. The primary fermentation process will "scrub" the bean and leave littel original (fresh) flavor in your beer. I also transfer the bean into the keg, but if you bottle it should still be just as good. I also buy my vanilla beans from
Arizona Vanilla Company because its fresh and cheap. They had a free shipping special and I spent $3.50 on two fresh clean perfect beans (pretty good since I spend $6 on apricot flavoring). I know you can find cheaper, or more beans on ebay for that price... but I like have a solid sorce, and its not that bad of a price.
Split them, and soak them in beer. The alcohol and mild fermentation of the secondary should extract enough flavor to be subtle yet expected(1 bean per 5 gallons in secondary).
Thats my two cents
