One of the STOCK window door labels allows you to show BOTH the ROOM ID and the DOOR ID...
Busy rendering at the moment, so I can't let you know which one... (might be the NCS one??)
I presume that would suit your needs...
Duane
Visual Frontiers
AC25 :|: AC26 :|: AC27
:|: Enscape3.4:|:TwinMotion
DellXPS 4.7ghz i7:|: 8gb GPU 1070ti / Alienware M18 Laptop