It would be an interesting and odd maneuver -- after all, there are already two live-action Alfred Pennyworths in play -- but it's backed up by a trademark filing for "Pennyworth" in the realm of TV and film.
BC offers a few alternatives -- the film could possibly be a direct-to-video animated feature or a series that centers on Alfred's daughter Julia -- and as with any trademark filing, it could ultimately come to nothing.
A likely scenario -- and one that could tie into either Gotham (in which Pennyworth is played by Sean Pertwee) or Batman V Superman: Dawn of Justice (Jeremy Irons) -- is a webseries companion to existing media.
That said, such a filing is generally approved when there's a credible move toward actually making something. It's difficult to trademark things on a whim on the off chance you one day decide to exploit the trademark.