Hi Bester -
Just a word of caution - Make sure all your channels are in stopped state while you take the copy of the system. Else when you prepare your production system then all your channel will be started.
And coming to your question - As suggested by inaki, you can make use of directory content migration tool. You can find step by step procedure in the below document.
Moving Integration Directory Artifacts from dual stack to single stack
Iñaki Vila : I see that this migration tool is not only for AEX but also available on PO, Dual Stack too. Refer to the comments by Alexander Bundschuhin the above shared link