There's an unreleased namespace called ImportExport that has the ability to import and export various objects. I have not used it in awhile, but you could possibly use unreleased commands and string them together in a released command to create a poor-man's copy:
1. Export to X.
2. Import from X.
3. Output DBKey
I'm not sure if there are any other unreleased CLIs for just "Copy" by itself.