How to solve the One head/Rev Head problem

[Helios]

When there is one head/revhead left on the station, Centcomm/Syndicate report the rough location of the remaining head/rev head.
If it is only one head of staff, the "Contact Centcomm" option is replaced with the "Contact [UNKNOWN]" option of emagging it, at which point hints of the location of the remaining head can be given at the admin's discretion