Steve, solution is simple...
1. Obtain and fit a telematics glovebox.
2. Take a 1m rca audio cable... connect one end to single din DAB unit and fit to glovebox slot.
3. Remove NCDC unit and separate CD changer.
4. Cut the audio and ground wires on ribbon as per russian guide on tinterweb... search NCDC aux in
5. Connect L + R rca leads to respective ribbon on the head unit side, grounds go to a common wire, so effectively three connections.
6. Rebuild NCDC and refit.
7. Switch both on and select CDC on NCDC and switch on DAB unit. Set the output levels to suit your needs.
Net result, stock dash, and neat installation. Only point to consider is that you fit the rca lead from behind everything. Power for the Alpine unit comes from the telematics loom, again only three connections... ign pos, pos and gnd