Automatically tag photos that are added to a narrative via the app with the modifier type of the narrative and the chapter. This way, you can sort by the modifier type and/or chapter for the client summary without multiple extra touches to tag every photo. Then, the only photos you have to manually tag are any gallery photos that you want in the client review but not in a narrative yet.
For example, if you add all your photos to narratives as you go, at the end you just filter for "major concern", "repair/replace", and "safety" (or whatever combo you want) and you can do a client summary without manually tagging a single photo.
You can always un-tag an auto tag if you know you don't want that picture in the client summary.