My 1st successful honor mode playthrough i did it as a vengeance paladin with shadowheart as a life cleric, astarion as a gloomstalker assassin, and wyll as a sorlock. I used invis potions and barrelmancy for all sorts of shenanigans. You can steal lots of stuff using an arrow of darkness or darkness the spell. Lots of great gear is just lying out in the open. You have to be really mercenary in honor mode. Feelings are for those who don't have the golden dice. So kill anyone for good gear if you can get away with it. A good example is the lady near the gith creche. She gets murdered for her gear. Usually after a failed pickpocket attempt. Same with the creche trader. Try to do as many combats as you can because you won't be overleveled like in normal playthroughs so you'll need the xp.

Edit: Also I was playing dark urge because the fight against Orin is simple af when you play as dark urge who has slayer form.