I've done it. Basically, you need to have the XPression machine set up as a Rosstalk device on the Carbonite. Then you need to create a macro on the Carbonite that takes the take item on XPression. You can tell it what take id to use, and which layer or channel to use. While recording the macro, you can select the XPression input, then press NEXT a couple of times to get to the screen where you can specify the take id, etc.
In your macro, you will need to add a pause before the cut to make sure that your cut happens under the fullscreen portion of the transition.
#XPression