I'm just educated-guessing but if the Aaargh pals aren't dumped then you'll need hacked roms from a dev with a strong understanding of the system and the willingness to do you a huge favor, or maybe faked pals or both. You might find pals from http://www.jammarcade.net/pal-dumps/ that aren't in mame. The first thing I would do is swap the pals and roms with a game that has its pals dumped and see if it runs.