Historically when it has worked to move a player back and forth between forward and defense it's because it's a player is both talented and highly intelligent. That player didn't always have to be a star level player either although that certainly didn't hurt. Here are some historical names off the top of my head: Mark Howe (star), Red Kelly (star), Sergei Fedorov (star), Sami Kapanen, Lou Nanne, Jimmy Roberts, Doug Mohns, Babe Pratt (star).
On this current team, 3 of the 4 star forwards could drop back and hold their own. Maybe Rielly could jump up and not embarrass himself. For a defenseman like Dermott, I think any random Marlies' forward would be better. Occasionally out of necessity with a roster short term roster issue a defenseman has to be moved up for a game or two.