Currently I have a series of views, content templates, and relationship forms that is allowing me to edit existing relationships (cast) that are connected with drama post types. Attached is an image of how the "Edit" link looks.
When you click "edit" for a specific person, you can edit this person's "role" for this specific "drama" post type. See 2nd image attached.
I have this code in my loop item for the view "Edit Link for Cast-Dramas".