My neightbor has the 7 seater and I have the 5 seater. If you can find a busted up Journey with the 7 seats you *CAN* easily swap the moulding, rails and seatbelts. All the connections are there but the 5 seater trim doesn't give access.
I'm currently searching junkyards for busted up Journeys but with no success. I know it can be done, just have to have the pieces.