I thought I'd share my Pathfinder conversion of Rowyn from "There is No Honor," done with Heroic NPC stats.
To keep her as a CR 5, I added a level of bard, though I suppose you could argue with the wealth she has (I left the gear as presented in the mod) she might actually be CR 6 (I didn't think it reached that level, but obviously YMMV). I also used the poisoner archetype, as I thought that seemed appropriate.
I kept the tactics the same, so her AC and melee attack reflect her use of Combat Expertise.
Rowyn Kellani CR 5
Female human rogue (poisoner) 3/bard 3
NE Medium humanoid
Init +3; Senses Perception +8
===== Defense =====
AC 20, touch 16, flat-footed 14 (+4 armor, +3 Dex, +3 dodge)
hp 33 (6d8+6)
Fort +3, Ref +9, Will +3; +4 vs. bardic performance, languagedependent, and sonic
Defensive Abilities evasion, uncanny dodge
===== Offense =====
Spd 30 ft.
Melee +1 rapier +6 (1d6+1/18-20)
Ranged mwk hand crossbow +7 (1d4/19-20 plus poison)
Special Attacks bardic performance (6 rounds/day, standard action), countersong, distraction, fascinate, inspire competence +2, inspire courage +1, sneak attack +2d6
Bard Spells Known (CL 3rd, concentration +5)
1st (4/day)--beguiling gift (DC 13), charm person (DC 13), liberating command, vanish
0 (at will)--dancing lights, daze (DC 12), detect magic, mage hand, read magic, unwitting ally (DC 12)
===== Statistics =====
Str 10, Dex 16, Con 12, Int 14, Wis 8, Cha 15
Base Atk +4; CMB +4; CMD 17
Feats Combat Expertise, Dodge, Improved Feint, Weapon Finesse
Skills Acrobatics +12, Appraise +6, Bluff +9, Climb +4, Craft (alchemy) +11, Disable Device +8, Disguise +7, Escape Artist +12, Intimidate +7, Knowledge (local) +8, Perception +8, Perform (Oratory) +11, Sleight of Hand +11, Spellcraft +9, Stealth +11
Languages Common, Infernal, Polyglot
SQ bardic knowledge +1, master poisoner, poison use, rogue talent (swift poison), versatile performance (oratory), well-versed
Combat Gear potion of cure moderate wounds, potion of gaseous form, wand of animate dead (5 charges), wand of charm person (35 charges); Other Gear combat gear, +1 leather armor, masterwork buckler, +1 rapier, masterwork hand crossbow with 10 bolts poison with black adder venom (save Fort DC 11, frequency 1/round for 6 rounds, effect 1d2 Con, cure 1 save), gold earrings worth 300 gp, bejeweled necklace worth 200 gp, skeleton key (fits all locks in guildhall, including the treasury door)
Clearly you have raised her level of threat considerably. Her Rapier attack has improved by 3 and her spell selection is vastly more dangerous. Only you know your party well enough to know if that is the right thing.
Looking at the Obits thread the final fight with Rowyn has not caused to much of a problem. For a final fight it should be tough so I would go for it.
It is certainly a nice conversion.