Is there a way or a module to give me a R.A.P. +12 output that can plug into the factory monsoon stereo?

here is the situation:
2008 Solstice, Monsoon Stereo and OnStar
I am not replacing the head unit, amplifier, or speakers. all I want to do is add my Sirius Sportster 4 to my system. I have the hard wire power supply, but need a +12 source to power it when the radio is on.

Is there a module to do this, or somewher eelse I can grab R.A.P. +12 (the monsoon amp maybe?) all the other +12 sources go off as soon as the key is not in the "run" position - less than useful.

The solution I opted for is better than nothing but less than Ideal.

There is a pink wire on the top connector for the amp (pin 3 IIRC) that gives the amplifier it's signal to turn on - I used this wire to trigger a relay that provides power to my sirius reciever.

this way any time the radio is on the sirius is also on, but it also turns on any time GMLAN powers on the amplifier to do any of it's stuff, warning bells, etc. Less than Ideal but better than nothing.

hope this may help someone in the future.