Almost any other airlines (KLM/BA/Qatar/Finnair...) already offer this benefit for their gold members and guests travelling in C.
It is my understanding that CPH fast track is generally not available for non-SK status passengers, who travel in Y. There might be exceptions.
From my observation: the fast lane is not always faster than the normal line for the plebs. It does not only matter how long the queue is, it also matters how many security checkpoints are open, where a queue is leading too.
If the fast track line leads to one security checkpoint, but the plebs line leads to 6 security checkpoints, then the existence of the fast track line is a joke.