Below is an example of how this would work, if we put it in a web part zone under EACH sub site on the left side.
What this will require:
Create a custom view of the Pages list for each subsite (2001 - 2010).
Add it to every page.
Hide every page from "ordinary" navigation.
It works, but it is a work-around effort.
Below is how it would look, once assigned to the left, and it would appear below each subsequent sub site.
Also, we won't know exactly how it behaves on the left until IT is able to get the layout published with the left web part zone.