Makes sense - I do like the feel of it, and in that case maybe some method to make this all more transparent to the players. I mean, in fact, why not just play this turn out in front of them? The stuff about supply lines and things like wanted posters all make this seem like it's just creating opportunities for them, and there could be nice tension seeing this unfold, especially since you indicate this should be after they reach a higher Tier anyway. At that point they would conceivably have the resources and connections to learn about some of the vampire's actions as they unfold.