Originally Posted by
Grod_The_Giant
A one-level dip in Inspired Blade Swashbuckler sounds like a good start, netting you 2/3 of the Dex to damage feat, some swordplay techniques and Int+Cha Panache points. You might also throw in a level of Investigator for Inspiration and class skills. (A second level and the Empiricist archetype gets you Int as your key ability score for a whole bunch more skills, too).
Bruising Intellect and Student of Philosophy let you keep up some of the traditional scariness/party-facing.
If you can import from 3.5, Knowledge Devotion is THE classic smarts-in-combat option