Ahh, an interesting possibility Chef Ben.
Indeed, while PC roleplaying games set in China's Warring States period are legion, table top games are much harder to come by.
However, my ever dilligent staff of fawning attendents did manage to uncover this site which includes reference to a Romance of the Three Kingdoms d20 game as well as Jadeclaw (which may be stretching my own definition of Romanticised somewhat severely).