Trying to account for Chaos Shuffle is silly — it's a stupid trick, and in a campaign that uses it this class isn't going to blow anyone out of the water just because it trades out four bonus feats. And people can qualify with them as written anyway, because "equivalents" like the ranger's Combat Style count as feats for purposes of qualification.
Perfect Two Weapon Fighting is in the ELH, and on the SRD. It's one of those Epic Feats that has no business being an epic feat.
I support Noctis in this. The only perfectly-by-RAW way to use those TWF feats alongside unarmed striking is to mix a one-handed weapon with unarmed attacks (which, coincidentally, fits the wuxia image exactly).
+1 for swift action healing Dim Mak.
You should tone it down, I think. Not all youxia in the stories are Buddhist monks, dedicated Buddhists or even Buddhist at all (the Wudang school is usually cast as Taoist, for instance) — and of those that are, the stories they're set in don't always take such a harsh attitude towards killing guys. In fact, killing someone as a matter of honor or simple opposition is usually par for the course in jiang hu. There's a classic poem that's kind of the definitive statement of what wuxia is about:
In other words: you don't devote yourself to a life of enforcing justice and become a master swordsman so you can not kill people.Originally Posted by The Swordsman, by Jia Dao
Historically, this is wildly incorrect. For much of human history in much of the world, judicial combat was a primary means of settling civil disputes.
Goku is a pretty poor model for a youxia, if only because he doesn't care about honor in the slightest. He might make for a pretty good Buddhist monk, but you should allow for different takes.
It's not. I could see mid-to-high Tier 4 argued, but I'm inclined to say middle-ground Tier 3.