I oddly can't find this information on the net so I'm gonna ask here to make sure. I should be able to make a rgb/audio cable using a mini-din 10pin connector going straight to rgb and audio ports yes? Just following this pinnout guide http://www.gamesx.com/avpinouts/saturnav.htm
I got a commission to build a cable thats just straight to rgb, despite them owning a scart to rgb adapter. Who am I to complain right? They did note what you told them on one of their links on that page.