Oops, I missed that you intended to put the radio module in the glove box as well...

Yes, the DSP amp will function if both the radio and MID are installed somewhere in the car. So, you could switch the radio to CD mode and run the aftermarket HU's RCA output's to the PA-12. I cannot think of a reason that would not work.

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input