The UV would be best bought as a screw on and the P adapter screwed on to that as yjr UV Filter will be left on most of the time. You can get step down adapters as well. Not sure about the hood but I think there may be some available to slot in to the P adapter. Cokin make a clip on shade piece that can be stacked.
http://www.pictureline.com/product.php?id=2410