To update this, yes the remote amp turn on feeding the car harness will work. Its loud of fuuuck and has static through all speakers. But, for now, it is a working radio.
I found the 4 channel piece of electrical wizardry that I would assume lowers the output of HU to a more appropriate level for Bose speakers. I will install that when I have the time.
For now, rocking to some excellent classic linkin pack, thanks BLS