There's currently no way to "flatten" tables into other tables for purposes of header identification. By the time you nailed down the coordinates of tables you wished to flatten, you might as well have been using depth/count coordinates to begin with.

One feature the module lacks is tracking downward ownership of tables (i.e., what subtables does a particular table have). You can do this in the opposite direction, going back up the tree, but not downward. Such information could be useful in cases like this.

For the time being, however, your solution is about as good as it gets for your particular case.

Matt