Internal Phabricator isn't even really Phabricator anymore. In fact, the name changed to just Diffs. I'm pretty sure its entire codebase has been rewritten, at the very least into Hack from PHP. They have a custom API; not Conduit. Etc.

So, no. They wont support Phorge. They really never supported open-source Phabricator after Evan left and made it his own with Phacility.