It's not quite as detailed as yours, but I use a "trick" of the same kind to chase those obsessive thoughts.

I see myself on top of a miles high cliff, standing next to a safe. I somehow extirpate the thought by breathing it out into the vault, which I then lock and push off the cliff. I then have to wait and when I "hear" a distant noise, I can't remember the thought, even though my mind perversely tries to remember.

Anyway, I'm glad to see I'm not the only one having to resort to such tactics...