Clearly, I would be far more at ease speaking of a community in this sense - a community of allegoresis, a community that is such only in alliance that not only does not cancel out the singularity of allies but, on the contrary, accentuates it. I would have far fewer difficulties and reservations in accepting the image of a community that does not constitute itself on the basis of contemporareity of presences but rather through the opening produced by what you have called allegoresis - that is, the interpretation of a text not given, not closed in on itself, an interpretation that itself transforms the text.
But is Derrida ready for the other that Baum lets into Oz and Shelley Jackson uses as pieces of her Patchwork Girl?
I think he would enjoy her and her excesses.
Jackson performs within a singular subjectivity what Derrida discusses in relation to community. The main character is quilt of different identities -- quite literally her body is made up of pieces of others' bodies (Frankenstein) and these parts make up the subjectivity of her. She is part and whole simultaneously.