You don't need to be in pmdev to implement a push-model templater. You keep (on your computer) the boilerplate and the list of nodes to update and you put in the nodes to be updated transparent markers to surround where you want the boilerplate to be inserted, like "<!--TOC:-->...<!--:-->".

Then you write a small Perl script that iterates over the list of node IDs, uses an XML ticker to grab the node's current content, use a regex to update the boilerplate content, preserving the markers, then POST the updated node.

And PerlMonks::Mechanized (beta) is probably at least a good place to start.

Working in pmdev is much less convenient and much more frustrating so it is good to not have to implement this in that environment.