Think I might have found a solution...
Basically you follow the instructions in the video. Instead of using a Fade In/Fade Out behavior, you will need to keyframe the Opacity of the top clone. Try to make enough overlap to go as far as you can manage (below is about half.) The project play range was reduced from 20 (setup) to 12 seconds in my trial and I cut the clone layers at 6 seconds.
Once you keyframe the Opacity, right click on the Opacity parameter and "Show in Keyframe Editor". Select the two endpoints and right click on one of them and for the Interpolation, set it to Bezier. Create the type of shape you see below... This will slow the fade in to blend at a slower rate. The last keyframe should be close to linear (at least that's how I liked it), but adjust it how you like.
Put the project loop end marker on the last frame of the Play Range.
HTH