Since the current gacha shows what the stance is for the One-Handed Blunt Weapon, and it's static btw, I decided to test out some of my toys and here's what I found:
1H Blunt Stance using Ruyuefeixue's Butterfly Fan
1H Blunt Normal vs. 1H Blunt Stance using Chocolate Almond Fondue Stick (note: this will also work on the "Duster" weapon)
I don't know how to post gifs for the second picture. The first few seconds shows noncombat + combat stances, and the next few seconds show what happens if you activate the 1H Blunt Stance with the stick.
I want to see the lance stance on a giant using a shield. I bet it looks a lot cooler than what we get to see on the gacha preview.