Ooh, this thread has a giant target on its head, waiting patiently for someone to break the rules and get themselves a piracy ban. I should probably get this out of the way:
Under no circumstances is anybody to post or ask for a pre-merged disc image, or any other downloads containing copyrighted data. Tutorials and scripts are perfectly fine, as long as you use them on images ripped from your own legal discs. ~Covarr
Unfortunately, I don't know where to find this. While there is some PSX content on this site, we have typically focused more on the PC version.
It looks like the scripts you found require a hacked emulator and the right plugin in order to run a DVD5 PS1 image. Is there any way at all to get a merged game to play in a more accurate emulator, such as XEBRA or Mednafen?