This sounds easy, but it's not. The neutrino detector needs to be far underground (to shield it from cosmic rays), is pretty heavy (I remember something about

This sounds easy, but it's not. The neutrino detector needs to be far underground (to shield it from cosmic rays), is pretty heavy (I remember something about 60 metric tons, but it could be more), its location needs to known very precisely, and it needs the same sophisticated timing infrastructure as OPERA has. I guess it would be easier to build another neutrino emitter at a different particle accelerator, and direct the beam towards the OPERA lab (or another existing lab).