Do you have a friend with a jailbroken ps3? maybe if you're really nice to them they can come over and do a data transfer between the two systems. If they do, they might have the knowledge to help you out cause on their end its quite simple.
Showtime can be modded to install as a PSN GAME. Showtime has a cinavia bypass built in to it.
You and he would need to be on the same version of firmware, just to be safe ie: him on 4.46cfw you on 4.46 ofw, or whatever # your on.
I can supply a modified package but its useless to you. they would have to install it and then transfer to your system via ethernet cable.
BUT if you find someone that's J/b'd, help is around the corner.
And you would have to play only from usb. direct disk access is not available.