Maybe... though if you intend to delete the file very soon after it's been written and you have delayed forwarding, you may already be deleting it before the forwarder even starts to get a handle on the file.
As an alternative, you can see what happens if you set ignoreOlderThan=3d
or something similar in inputs.conf - the forwarder might let go of the file entirely by then.
Have you tried the special Windows-only [MonitorNoHandle://<path>]
in inputs.conf?
Won't this allow deletion of a file that is not completely indexed yet?