Sit him in front of the back 4 and let him do nothing else other than protect the vulnerable parts of the defence. He's one of the few players I've seen that actually has the discipline to happily do just that.
Song, Artea, Ramsey, Wilshere, Rosicky and Coquelin can all fight it out for the other two spots in the midfield. Whilst Song, Arteta, and Coquelin could also play M'Vila's role when required.
I really do think a good player playing that role could make this team a better one.