Oh no doubt, for his career Manure would do wonders. I have no doubt Fergie would squeeze every ounce of talent he has.
I have not watched many Man U games so I won't comment on how they would play, I'll just say the thing Modric is always gonna have going for him is work rate, technical skill, vision and ability to play wherever is needed and as such, he'd fit into any freaking system is needed. But personally he's the best in the dead middle with a clumsy ball winner like Sissoko with him, so he can see as much of the ball as possible.
Yeah, Birmingham is actually on top of my shitlist. They're partly responsible for us missing the WC. Cunts.