So, just to make sure I'm caught up with all of this...
We have the .pkg for the backup program that rips and plays the games?
All we have to do is figure out how the PSJailbreak is formatted/spoofed as a debug trigger?
That might be quite difficult, at least to start. They are using a duplicate of the JIG to drop the box into service mode, then patching memory locations as a debug FW install would require a different approach.
On a Service Mode system , a full debug fw install takes about 5-7 minutes, then will need to be rebooted - at which point it would fail. This, clearly does not take anywhere near that long to get setup - best guess is that it is loading a self, however they have found a code exploit that will allow them to alter system data, tricking the system into running unsigned code (the fake self inside of the manager).
With this - we should however be able to run homebrew (which, is a plus!) - but of course good homebrew will take some time, will be fun however to get a genesis emu on the PS3 that works well!