New weapons are always a good thing apart from the harder time balancing, I have some suggestions for Saltzpyres melee.
First and foremost, I know the characters personality, style and lore is a huge factor.
When I think of Saltzpyre the image that comes to my head is a rampant man, doing the orders work as a swift, duellist, Witch Hunter slaying anything he considers evil with style.
Not the type familiar with slow, heavy weapons.
A variant of the rapier would be perfect, offering different properties and play styles. Similar to how the elf has Dual Swords, Dual Daggers and Sword and Dagger.
We currently have Rapier and the individual Brace of Pistol.
A Rapier + Buckler and/or Rapier + Dagger is my idea/suggestion.
Sacrificing the medium range of the pistol for a close range Shove/stagger (Buckler) or a devastating lunge/stab (Dagger)
Increasing the push/block angle would also make sense for the rapier + buckler/dagger variants, he now has an offhand to block with.
This would also synergies with Witch Hunter Captain’s overlooked passive “Eternal Guard” that relies on push/block angle.
I have thoroughly enjoyed Saltzpyre, particularly Witch Hunter Captain, since the start of the game and this suggestion has been in my head since the very beginning.