Yes, I see what you mean and where you're coming from. Playing in the zone is a back and forth between conscious and unconscious thought. It's not all completely unconscious. The key is that these back and forth thoughts are in a particular order and length of time. When that order becomes disrupted, the player becomes distracted and loses the zone.
Disruptions can come from outside sources, like a person sharking him, or within the player's own mind, but either way, he suddenly stays in consciousness too long and disrupts the order of the zone routine.
When that happens to me, two things happen: My rhythm starts to slow down and I become more tentative and conscious (Other players will start to rush.). My fix is to find my rhythm, even if it means missing a shot or two to get it back. So be it. My body starts to recognize the rhythm and then the thought process becomes more flowing and the environment for getting back into the zone is established. Even if I don't quite make it back into the zone, I will have calmed down and fallen back into my routine.
I think the answer lies in feel rather than conscious thought to find your way back once you've lost it. I mean -- you have to be conscious, of course, but the purpose is to locate that feel that brings you back to your game rather than consciously control every bit of movement to try to find your way back. It may just be one thing, one trigger that brings you back.