Is there a trait to allow disguise as a class skill?
Keeper of the Veil - From Qadira Gateway to the East and is a regional trait.
Here is a cut and paste from Hero Lab that let me do a quick search.
Even when not cloaked in magic, your training has taught you how to conceal your true nature. You gain a +1 competence bonus on Bluff and Disguise checks, and one of these skills (your choice) is always a class skill for you.
You could also take the Cosmopolitan feat, which makes two mental-based skills class skills and gives you 2 extra languages (which could help make certain disguises more convincing).
I recommend picking up both Bluff as well as Disguise if it isn't already a class skill. Knowing the languages of whatever you are disguised as and being a good liar really makes disguises come together quite nicely.