Begin reducing the champagne and the vanilla bean in a nonreactive sauce pan until almost dry (about 2 tablespoons). Add the cream and boil for 2 minutes. Using a whisk, gradually incorporate the butter, and season with salt and pepper. Remove the vanilla bean, and add the lobster and stir constantly until it is heated through, remove from the heat. Dip the cooked pasta in the hot water bath for 30 seconds, drain, and place in a mixing bowl. Pour the sauce over the pasta and toss with 1 tablespoon of the chives. Adjust the seasonings and present in a shallow bowl garnished with the remaining chives.