here me out, I'm not skilled in this department but I bet acidmods, n00bz, or dax could figure this out.
The so called golden battery has a 4th pin that is used during the flashing, so couldnt they make a usb cable the has connectors to all the pins the batter hits? so the psp would be charged via the usb cable and hit that pin allowing an reverse enginneered program running on the pc to do the rest? we have the software so that should tell us how it does it right?