For Wano, what I would kill to see is them fighting a whole battalion of beast pirates and Orochi shogunate forces around Wano. Kinda like Minamoto Yoshinaka and his wife Tomoe Gozen.
It was the Battle of Awazu during the Genpei War, where the two and their forces were outnumbered by Minamoto Yoritomo's and Noriyori's forces. Yoshinaka even told Tomoe to leave the battle, as he did not want to die alongside a woman. The two finally set aside their differences, even for just a moment, to defeat the immeasurable numbers. I can see Zoro telling Tashigi to get lost, because he secretly doesn't want her to get hurt, while Tashigi opts to stay, saying it's her duty to help innocents(and because she doesn't want Zoro to fight these odds by himself). Really emphasize them as a warrior couple, similar to Yoshinaka and Tomoe. The kind who has each other's backs in the worst of times.
Tashigi is sort of like the Tomoe Gozen of the One Piece world. Somebody who proves swordswomen can be just as capable on the battlefield as swordsmen, so she would fit so well in Wano as that female presence who inspires more of the women in Wano to take up arms after or even during the war. And Zoro's already had some links with the Minamoto family, though a different one from Yoshinaka, being Yoshitsune.