I ended going with rogue as well. At normal difficulty, I don't think it really mattered. I went high resolve and perception to pump up his deflection as much as possible. I also have Eder and a custom paladin to do most of the tanking.
With the Grieving Mother always providing a flanking bonus, I can pretty safely just go one on one with a target ,especially with a priest to provide healing just in case.
I've gone with a single handed rapier and my second set is with a pistol, which is what I open up battles with. I shoot once, let my tanks engage and then charge anyone that's kind of hanging around
Honestly though, with combat moving as quickly as it does, it's pretty hard to actually get the feel that my character is in a swashbucklery type duel. There's just so much going on.
Still, it's been pretty fun so far.