I finally tried this myself on a closeup of a wristwatch with a moving second hand. The “shadow” from the motion correction where a little disturbing since the second hand had such clear boundaries against a smooth background. Also the exposure where pushed quite a bit which exaggerated the noise somewhat and made the motion correction more visible.
But the smooth transition function fixed that beautifully. Very nice, the sharp transition between the smooth PS background and the single picture very just gone. Well done!