So for future users, this is what worked.
1) Take AC unit buttons off original fascia, remove DUAL button, desolder SMD led and switch from PCB
2) Take AC unit buttons off new fascia, replace blank button with DUAL button, solder SMD led and switch to PCB
3) Use dremel to enlarge opening to fit standard Double DIN
4) Mount head unit to new fascia
5) Plug Nissan dual antenna to single antenna adapter between antenna lead and head unit
6) Remove Black wire (Ground) from headunit to ISO adapter, extend wire and attach to chassis (bare metal location)
7) plug headunit -> ISO adapater into ISO-> Nissan adapter
8) Refit dash
Enjoy.