Good news is that I know for fact that it is possible. I had such a CD changer in my A4000 for about one hundred years ago. Bad news is that I don´t remember exactly how. What I do remember is that each CD showed up at it´s own LUN number and all with same SCSI ID. I think I made 6 different mount files. 1 for each CD. All with same settings except mount name (CD1:, CD2:, etc) and LUN number (1 to 6)
Good luck on this. It can be done.
Regards Tjomp