Trying to create an efficient world flipping system

I am adding a world flip mechanic the a 2D Platforme.
I am looking for an efficient way of creating the world flip system. Not the actual flip, as I think what I built already is pretty good (I flip the camera and reverse gravity on the RigidBody2D and rotation of the Player)
But I am wondering what the best way to create a system in which a bunch of scripts can access a variable that tells them the world has flipped.
Right now I just have bool that is called worldFlip and it is a static in a class called WorldFlipSystem.

The PlatformerCharacter2D class needs to know if the world has flipped because I need to invert the m_JumpForce. But the way I am doing it is really inefficient because I just have it constantly looking to see if the WorldFlipSystem.worldFlip is True or false and then making the m_JumpForce negative or positive. But that is happening every frame. I want it to just do it once, right when the world flips.

I thought the way to do this was to create a method in the WorldFlipSystem class but I don't know how to make other classes know if a method has been activated or now without creating an instance of all classes in the class that is doing the method. Hopefully there is an easier way.

tldr; How do I create a system that has a switch, and allows any other class to see when that switch happens?

Thanks

 

What makes you think this is at all inefficient? Have you found issues profiling it?