It would be interessting, but I feel that this SCP should be one that has been in the wazy of the player for a long time, rather than being something completely new to the player. And seeing that the player interacts the most with 173 and 106, I don't know how that would work. Actualy I have an idea if it was 106, except the player wouldn't be fighting an SCP, but rather a human (a guard or d-class). The fight for who gets sacrificed to 106. It would end in the player throwing the guard/d-class into the femur breaker and pressing the button to activate it. After that a mobile task force would enter the containment chamber and capture the player. This could also be an ending idea, but idk.