Create an e_end for plugins?

[oudoken]

Hi there,
There's a way to capture the OB at the very end of page from within a plugin?
I'm trying to integrate phpfastcache with e107 for creating static html pages (see also https://www.e107help.org/4108/capture-buffering-from-plugin).
For ob_start() e_module.php works fine but how to get the end page? e_footer.php it's called to early.
Maybe there's another method or it will be a good addition making an "e_end.php" to expose this functionality to plugins?
Thanks
Rob