The changer itself is not located in the trunk, but in the dash, too, taking up a DIN-slot. So with a little magic of an experienced installer it might be possible to relocate the CD change to another place.

Cool! That could work well if done carefully. Perhaps move the changer from the DIN slot to the glove box.

If you wanted, you might even be able to get the empeg's outputs to be switched in with the CD changer's outputs, so that you could skip installation of an amplifer and just use the existing stereo. Some kind of an A/B switch to select between the changer's audio and the empeg's audio. Of course, you'll end up leaving the switch in "empeg" mode most of the time...