I think you can just plug your internet cable into the Xbox to download the patch, otherwise i don't see why you could'nt put the patch on a USB stick or burn it to disc.
His XBOX has been banned from Live, though I am not sure if that counts towards a Silver Membership, which is all you need to download patches. It may just be banned from from getting a Gold Membership. Hehe, I wonder if that XBOX was J-Tagged.