I am just about to bottle a 5 gal batch of Kurts Apple Pie mead. It calls for two whole vanilla madagascar beans (+ cinnamon sticks) in secondary. I did not split them, I did soak in vodka overnight and added the whole thing into secondary. I used a hop bag with sanitized monofilament line (fishing line) to put them in. The idea was to make it easier to pull them when it tasted right. Life happens, I forgot about them and after 4 weeks the Cinnamon and Vanilla flavor was very intense, I pulled the beans and sticks. Now after 3 month of bulk aging the vanilla and cinnamon are just a background notes. Delicious. Side note: tie the bag at the top so that the end comes into the carboy neck, not the middle where it will get stuck. Dough!