Well, if you can get out of this in a method I haven't thought of yet, then I applaud you. This scenario has massively tilted odds. The chances that you will, in fact, fail to save the Vampire Republic from Jack's plans are far greater than your chance of success. Even if you do kill Jack, there are far more variables to this story, including the AI's, Onikage, and, of course, Heaven's Greatest Weapon.