I haven't tested myself yet, but just a thought here.
You don't really need to search for PSN debug installs, you should be able to just use the registry editor, try playing with these;
Maybe it'll connect to sony as if it were a debug ps3 to download debug updates?Code:/setting/system/debugGameType ? 0 /setting/system/debugSystemUpdate ? 0 /setting/np/debug ? 0