Document title in footer (using DITA)

We want to put our document title in the footer. I did it by editing the FM template to include an empty DocTitle variable, and importing a DocTitle variable from another file into the book after map-to-book.

This works well. But is there a way to accomplish something similar that doesn't require post-processing after map-to-book?

Currently, the only mention of the document title is in the title attribute of the map element in the ditamap file. Any suggestions on how to automatically pull the document title from the map attribute into the structured FM template for footer use?

If it requires much coding, it may be easier to continue the manual import. But I wanted to check in case there's a simple solution. Any thoughts?

Thanks,

Larry