Actually, that brings up an interesting point—is the labelling process suggested here inherently subvocally-auditory? Can we visualize icons representing our experiences rather than subvocalizing words representing them, or does switching from Linear to Gestalt change the effect this practice has on executive function?

I'm not in a good position to comment on how effective various methods are for learning to go from stage one to stage four, since stage four is my default state, but using visual representations works fine for me, and I expect it'd work for anyone who's used to thinking in a visual rather than word-based format in any other context. Using a gestalt might be too distracting for most people to start with, though, and may be slightly more dangerous.