Then I suggest this plan as the final one. Let those two scout, I'll attack the main entrance, and you guys will be on the balcony. If something happens at the entrance, I'll sprint away, they'll cover me, and we'll lure the guys into the hall for your shooting. If something happens in the hall, you'll shoot. Meanwhile, one of you will keep an eye on what's happening in area A, just don't get too distracted by the Ipomea. If the king or his sister start causing trouble and attacking her, then Merette will have to jump in.
The only remaining question is the positioning of the archer and Merette on this balcony. I placed her near the stairs so she can react if anything happens, and him further away so they can't reach him. Plus, from there, he can shoot at some part of area A. And Merette can probably shoot at some of the cells south of the entrance to the hall if the door is open. But maybe we can reposition them somehow?