Maybe some kind of basket hilted sword (think English Civil War or Scottish examples) with a buckler could work for both Salts and Kruber. Give it regular slashing attacks like SnS and for the heavy attacks H1= Stab, H2 = Elf Sword H3, H3 = Either same as H2 but from the other side or it’s just a vertical two hand grip strike to the head. It should push like a 1 handed sword but it’s push attack should be a punch which if done to the head guarantees a stagger on anything smaller than a chaos warrior. It should also have reposte with stabbing and slashing attacks and it’s special should count as a block with the party trait if timed properly, otherwise you still get hit but maybe take 30-50% reduced damage.
As for shield and flail, I could see the heavies being Sienna’s H1 and then Salt’s heavies reversed. The push attack I think should be a diagonal strike from top left to bottom right with increased crit chance and finesse or armour penetration. Whether they keep the light attacks the same I don’t mind.