Export the FCP project, import it in Premiere Pro. From there, import the saved Premiere project into AE to retain the clips. How you get it back to FCP is anotehr matter, but simply rendering from AE should suffice. For everything else, Automatic Duck or BorisFX' XML Transfer would certainly offer a way to get this working in both directions....
You have Color with Studio 2. It totally rocks. Completely new interface that is node-based but ti doesn't seem like it could be any more difficult thatn going to another platform or suite.