I haven't messed with the hacking tools in years but I'm pretty sure they can dump the bios/firmware through the USB port. The hardware changed drastically between revisions and on top of that one version of the firmware is only going to get you so far. It's not something that can be hardware dumped and put back together easily at all. It's possible but, I mean I could list the details but it would be a waste of time. To get half the versions that way you'll brick 30 PSPs. A software USB solution and you could get all the versions and brick 0 (maybe, most everything is probably updated unless it's still NOS boxed or something). Some games came with bios/firmware updates included in the game as well. And as far as redumping all the 1,000 games to not have intros etc., that'll be another problem.
A mamedev contacting the crackers is probably the best idea to get all the versions, I doubt anyone else kept them all archived but who knows.