Wait so, you want to even be against other vampires? Just your group ruling everything and answering to no one ? Sounds great, count me in, I just want to say I was there for the fun of it, and I'll bring the army "just for giggles" to "protect" you guys.
But seriously, Vampires may very well be KoS everywhere openly. When personas come into play, it might be easier to start such idea's, but right now, it very well links your account and activity to the sort of gameplay that people can go after and shutdown and say they did the right thing.
I think, the only way I can help you, is to offer this advice : Brainstorm and discuss all potential idea's, but never put anything concrete planning wise into writing yet. When 20+ other groups catch on and start the same thing as you, then it's time to round them all up and become some coalition/association and start this underground in a safe way.
The reason for this, is build traction, and do not paint a target on yourself. We "lawful" players want you to succeed as much as we want to come after you and have our own victory, because the conditions of our success require that someone lost something, a real tug of war with real high stakes, pun intended.