If it is a straight forward double din then someone like Sextons do fascias, obviously depends if it a facelift model or not.
Not sure about the birdview screen but looking at the adapters that came with the satnav cubby I bought I doubt it will have an av inout, you might have to get a liliput screen or something.
Doesn't your HU have video input, you could run a freeview box through that? Some Pioneer units have an av out too so that might be an option...