In a small saucepan, combine cream, ¼ cup sugar, bourbon, reserved vanilla bean seeds, and salt. Bring to a simmer over medium-low heat; do not boil. Slowly add cream mixture to egg yolks, whisking constantly. Skim off any foam on top of custard. Evenly divide custard mixture between 2 (8-ounce) custard cups. Place cups in a 13x9-inch baking dish. Pour enough hot water to come halfway up sides of custard cups. Bake for 1 hour 10 minutes or until centers are set. Loosely shield with aluminum foil if custards begin to brown. Carefully remove custard cups from hot water. Let cool on a wire rack for 1 hour. Cover, and refrigerate for 4 hours to overnight.