I have no idea that's the best or something, but yeah, seems a really good threat against a level change.
I also love to see a fighter uses the uppercut to the somewhere like chest to threat for the level change and his opponent wrestler starts visibly hesitating.
sometime those strikes turn into the great timing counter to the head as a result.
Ramble's right uppercut against Davis
Shlemenko's left middle hook? (Idk the proper name) against Brennan Ward
Hendo's uppercut KOed Renso (IIRC)
Derek Anderson's middle kick KOed Girtz
Additionally, I think it's more affected when they are in the open-guard situation (orthodox vs southpaw) because there are a more openings and space to throw rear-side strikes.
another tricky example I really like was Holloway vs. Bermudez.
Holloway looked for a lots spinning back kicks to the body and land it not once to the body, then to the head when Bermudez went for the sloppy level change.
after those little success, Holloway tried to do that again too often, though..