A flexible DM would let you swap out Stealth and Thievery as the automatic skills and plug in Streetwise and Diplomacy, given your description: "He's urbane and will spend his down time in some city tavern drinking, carousing, and wooing the ladies with tales of his exploits." He's a worldly sort, so it makes sense to spend the other skill slots on Perception, Insight and the Fighter-y stuff.
If you don't like the flavor of Backstab and Sneak Attack... Well, maybe you could get Power Strike instead of Backstab, but the fact is that the Thief has two real core traits: Sneak Attack plus skills and skill bonuses. Without SA, it's not a Thief. With SA, it's not really your concept.