Aloha Kali,
There is some good feedback for you here.
To reiterate:
You can do any of the harvesting exercises separately throughout the day - neck circles at stop lights, massaging your ears when it's tough to follow a lecturer, heal raises if you're a bit constipated, etc. They are not of the same "ilk" as the active exercises, which are basically active meditations you will go into the emptiness with at some point.
If you are going to sleep right after you mediation or active exercises, then leave your harvesting until you wake up the next morning.
IF you just have time for a single exercise, then you can follow it up with the abbreviated harvesting as JefferyC mentioned.
and yes, you could add which ever ones you'd like to include, but start with the massaging of the hands and face. Take your ques from Chunyi - when he abbreviates them, it's usually those first three or four, to basically bring your out of the mediation (active or sitting), then add your favorites.
Much Love,
Shawn