I think it would be interesting to see if the noise showed up under dyno conditions. bonnet up, engine noise and noise from the rollers i believe it could be hard to detect, but definitely worth a try. You would also have a base line figure after say 3 runs.

A repeat dyno (on the same machine) after the fix comes out would be interesting to compare figures, as long as ambient temperature was the same.

My only other thought would be 5000 + km before a dyno run as they can really load up the engine which i would not want to do on a low milage unit.