How to enable/disable RTPC (bound to Listener Cone)?

Question

For a specific game state, I want to activate a per emitter RTPC, bound to Listener Cone. When the game state ends, I want to deactivate the RTPC.
Specifically, when the player looks through binoculars I want to emphasize the sound emitters they're looking at.
I'm planning on using Listener Cone (which tells me the degree to which the player is looking at a sound emitter) to do this.  I only want this active while the binoculars are engaged.
What is the best way to do this?  I'm hoping there is something simple in code to activate / deactivate all instances of an RTPC like this. I do not want to hack it together with the wwise editors, like using a switch which has duplicate actor instances.
Thanks.