Would like to have the ability to move an EPIC to a a different workspace, it looks like this can only be completed at an initiative level currently?
You can move epics by updating the release associated with the epic. Go to the Epic details. On the release field, select a release that is in the desired workspace. That will move the record over.
You can find more details about moving records here: Aha! Roadmaps | Move records from one workspace to another