The answers are yes to 1,2,3 and 5.
At the moment i am using M lead from ac12 to front left DSP8000 but not sure if the pins linked in the S connector (the dealer supplied that M lead). I am going to replace the M lead with S lead tonight when i get home, will use din to bnc adapter at the ac12 end. Will report back after.
Thanks for the suggestion.

OZ

808.3, Control 10/twinstore, OPPO BD 83, 621, 861 V6, DSP 8000, DSP 7200HC, DSP 7200