Section E.2.8 doesn't actually specify any protocols or credential requirements. Might as well say, "We don't currently have any requirements."
How difficult would it be, do you think, to provide a REST API for uploading files/bitstreams containing data in the required usage data format? That REST API (whatever it is) could then easily be authenticated via Globus Auth. I'll bet there are already some well-established off-the-shelf REST upload/download APIs that we could use that already have decent access control mechanisms. (E.g., "user identity X can upload new data to namespace Y.") Is WebDAV RESTful?