It may or may not be a help, but I wrote a palette editor a while back for helping with palette shuffling, arranging, merging etc. It has an option to round any palette to 12 bits, which will give you OCS/ECS values, and gives you some hints about pens (e.g. sprite pen banks). It called PaletteEd, needs AGA to run, and you can find it
here and on
Aminet.