And there you go, if you wait long enough someone will come through with the correct answer, well done LGB.
LGB's last highlighted sentence says it all - "When the indicated DME zero range has a reference other than the DME antenna, consideration should be given to publishing this information. That is, unless NOTAMed or specified otherwise in publications, there should be no problem with using a NORMAL ILS/DME for DME-DME updates.
We live and learn, I sure did.
Old Smokey