04 envoy xl remote start

I have a (Spy 2 way alarm system with remote start) and trying to install in an 04 envoy which is equipped with GM's passlock 2, so I purchased an omega IB-GMBP bypass module that needs to be connected to ground (-) output when running, problem is the Spy starter module doesn't have this ground output when ruuning, does any one know how to get a ground out of this starter while it's running, I know I can use a relay to convert the second ignition into a negative output but I will need that 2nd ignition to connect to the vehicle's 2nd ignition for the remote starting so I need 3 ignition outputs while my module has only 2 any help will be much appreciated.

can I use any of the following wires for this purpose since I will not use any of them for their original purpose: trunk release, Microwave sensor, window rollup, slide door positive trigger, slide door negative trigger, or handbrake, can any of these wires give a negative output while running?