Is there such a Status Effect that only alters the distance that hidden objects can be spotted in the world?

 

I don't want to add an effect that alters Perception [negatively]--which would have the correct results but too sever of a penalty for what I wish to apply such Effect to.

No there's not much configuration for that.  It's based purely on Perception and, on the opposing side, the Difficulty of each object, which can be set in the Unity data but, if it isn't, pulls from GlobalGameSettingsGameData (CombatSettingsComponent) value TrapDefaultDifficulties.

 

Pretty hacky, but you could create a set of status effects that decrease Perception and then raise Accuracy and Reflex by the corresponding amounts to compensate for the debuff.