Can I replace Dahlia with Himeko

Hello everyone! I cannot really get more than 20-22k points in a current pure fiction (first half) with Boothill premium team (BH, Dahlia, Fugue all E0S0 + old man Gallagher E6). Sustainless doesn't really work here since they all have like 144-147 spd + mobs deal aoe dmg each time. I know how sustainless works, I know how to build it, but I'm not lucky enough with my artifacts.

So I'm wondering, is it possible to replace Dahlia with Himeko (E4 + her sig) to deal more aoe so BH can go straight to final boss faster? Or is me failing to get more points can only be fixed with vertical investment in BH?

To answer potential further question: I don't want to invest in Dahlia's and Fugue's Eidolons nor sigs