Yes you can power the rears from the HU
damelioj,
I did exactly what you're trying to do with an Alpine and the rear speaker deck two years ago. I don't recall exactly what harness I used, I think it was an Audi one that the forums said worked but it came from Crutchfield. I'm sure I could go back and find the paperwork.
I think I had to move some of the pins in either the harness from the HU or from the rear deck and got it all lined up and it works great. The two doors and dash are off of my 4x40 amp and the two rears are off of the HU.
Good luck with it.
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