Thank me later.

I paid the $11 for access to the wiring diagrams online to solve my Amp/DSP problem.
Turns out the AMP/DSP are the same component. Also looks like you can tap an unprocessed signal from the front via the Audio Control Module or back on the input side of the DSP/AMP.
Possible issue might be loss of volume control with tapping the signal pre-amp since the DSP/amp might control the volume digitally. Have not verified this. A work around is if your aftermarket DSP has a remote volume control, most do.