Interesting. Lydman-Beauchemin would be a nice shutdown pair. Fowler can play either side, so there is no concern there, and Allen(much like Beauchemin) should complement him nicely. Sbisa-Souray looks like a clear 3rd pairing.
This is probably experimentation though. Just throw it against the wall to see what sticks. You might get lucky. I wouldn't be surprised to see Fowler back with Beauchemin by the time training camp is over. A healthy Lydman can change things up though, because let's face it, he was damn good for us when he was healthy.