The Court of Deep Shadows - Fealty (Manipulation/getting other people to work for you) (2nd or 3rd Social trait)The Court of Deep Shadows credits its origins to the most ancient kingdoms in what is now China. Before the rise of the Qin Empire, the lands of China were wild with wrestling kingdoms and principalities. In those ancient times, a few enlightened individuals met in shadows after dark. There they spoke whispers of fealty not to kings or princes, but to each other, and to their goal: to have power over the powerful, to gain control over the controllers. The Court of Deep Shadows is analogous to the Lasombra, in that they prefer to be the power behind the throne, rather than the target sitting upon the throne. They seek influence in the most powerful organizations in the world, from governments to fast food chains. However, everything they have is the property of their King or Queen, the vampire who holds their fealty and the promise that if one grows more powerful, they both grow more powerful.
If you want to balance the anti-China bias further, the Willpower lineage could be a group of martial artists and monks who purify their bodies and spirits into diamond-like toughness.
I would actually see them more as a Gangrel analogue, or at least a Fortitude-analogue, than a Tremere- or Salubri-analogue. Perhaps their weakness could be desire to kill, maim, burn, etc, and they have to meditate and strengthen their Willpower to overcome these.
(That's also a big thing in Chinese/Buddhist philosophy, letting the will overcome bodily desires.)
You could have them take the place of the Shih in VTM - these monks could be the moral "police force" of the vampire world, to track down and destroy any vampires who go kill-mad or abuse their power violently.