You could try this to hide your party frames (not sure how that will react with other addons creating/hiding unitframes).
Code:
/script HidePartyFrame();
Ultimately, if you have another addon that adds click behaviors to unit frames (ie. Clique, Vuhdo), you could apply this same technique. Healbot just happens to have it's own unique frameset.

If the unit frames are in a uniform vertical/horizontal, it's pretty straightforward (your repeater regions will overlay all of the unit frames). If you have a grid layout, you'll have to create repeater regions for each row/column. Here's an example of a 2x5 grid with repeater overlays to illustrate what I'm talking about.