Hi not sure if this is technically possible, but would it be possible to implement Informed status based on, either distance to sector boundary, or within a defined area? Real system uses the latter.
So, for example, defining a flight as informed if coming within 15 NM of the sector but never entering it, or within a defined area, greater than the sector, like a buffer, but never entering the sector. Using the same logic as the rest of the areas.