Been doing a bit more research into this and a better option for you might bea WD HD TV LIVE box and use the WD TV remote app on your phone. This gives out 24/96 thru optical. Plus you can connect a HDD to it with all the music in the world and access it thru your phone. Only thing that would need to be confirmed is if it needs to be connected to a monitor to power up (if it checks HDMI handshake during start checks).
An alternative aswell for your power inverter would be to use a 12v intellistart that would normally be used for a carpc. You'll have to research this but another idea for you to auto start when ACC is initiated.
The Difference between Genius and insanity??............. Is the measure of success!