Object render Pass Through another object

Hi, I’ve a textured sphere which is actually a feed from a 360 camera. I want the player to see objects, particles and other game objects in the level through the sphere. with the camera and player in the center of the sphere. I looked at stencilling but it would mean modifying every material that is used to achieve the outcome. Is there a method where only the sphere can be modified without having to repeat it for every object in the game?