I just completed a POTD run with a ranged monk/wizard build using the Nelpazca subclass. I think it's the best for ranged. There's nothing to even spend wounds on as a ranged monk for half the game so you don't need to worry about running out of drugs, just pop em for big fights. Also, there's so many ranged enemies/movement abilities in this game, I worry helwalker's increased damage received would be pretty bad. Plus, your drugs start to last crazy amounts of time pretty quickly. I actually think Nelpazca might be the strongest of the three monks in general. If you stack armour and use whiteleaf on a Nelpazca monk with maxed alchemy you are basically unkillable. It regens something like 15+hp/3s for 1000s towards the end of the game.