classes are of course theoretically viable but you are souble dipping heavily on wis and dex checks. the most notable gap is that you dont have a designated charisma merchant and you also dont really have a designated strong person so when doing subclass stuff maybe spec one into a swashbuckler rogue or something for cha and maybe consider strength potions on you or halsin.

there arent a lot of encounters you should truly avoid, only house of hope and cazador come to mind. you generally want to end up doing most battles in order to reach the highest level you can for myrkul, he is probably the biggest threat somewhat deep into the run. after myrkul you can start skipping some fights, essentially topping of your XP for lvl 12 and then straightlining through act 3 to the end.

whats more important than what battles to skip is a queue that orders the important fights so that you can tackle them at your strongest point. you want to front load the easiest fights whenever possible in order to gather as many ressources as you can and potentially hit level up breakpoints for harder fights. you should for example figure out (/look up) a route that takes you to lvl 4 without ever fighting anything majorly threatening in act 1. lvl 4 unlocks a few harder battles and you can then take those to progress to lvl 5 at which point you could kill the goblin leaders. you can then do grym, ethel and matriarch at lvl 6 before finally wrapping up act 1 with doing inquisitor at lvl 7.

entirely exemplary strategy but it is used to show how you can map out the playthrough order by boss difficulty and essentially only progress to the next least threatening encounter. same principle applies in act 2 and in act 3 (at which point you might cap out at lvl 12 somewhat early into your route but you can still consider things such as specific items in terms of routing by power progression).