Hey Weapon,
Did they say it interferes with backup camera? Because I have the T Harness Backup camera addition:
Fits 2009 - 2014 Nissan 370z Navigation Video Interface Add TV DVD Backup Camera | eBay.
Not sure how well that would work having two T harnesses, etc.
Never Mind, I found the O/M Install manual and it has video camera inputs included. It seems "OK" but I feel that my current setup gives me adequate BT iPod emulation.
Of course it would be wonderful to get Carplay on the Navi head unit but that's not possible unless I replace the entire head unit and the Navi dash with the Cubby Dash, etc.
Right now I don't believe any Asia bridge device maker can offer CarPlay legally, even if they could get the Apple SDK somehow.