It's possible to install NSX rotors on GSR hubs, but you will have to do some work. Calipers with brackets and bolts, 11in rotors redrilled to 4 x 100 and appropriate pads. Also, it seems there's some metal that will need to be filed down for clearance.

I've got a local guy in Charlotte that upgraded his ITR to Acura Legend rotors and calipers. These are the same as NSX, but can be found for cheaper. I don't have all the tech information to do this swap, so I'd say keep researching, but it is possible.