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I don't think you are thinking this through fully. If you wire either the inverter or the DSATX to your battery, the only function of the ignition key is to signal a start or a stop to your PSU.
That means you can start the computer anytime you want without the key in the ignition as long as you put some power on either the switched input on the DSATX or the com port for your inverter solution. Basically, just run power from your battery, through a switch to your switched input.
However, if you ALSO use the ignition key accessory line to signal the computer to turn on and off, you will get your power supply out of synch with whether the car is on or not. Basically, you will push the momentary switch to turn it off, it will shut down, and then when you turn the car off the computer will start up again even though the car is off.
Hook it up the way 2k1Toaster says in the post I linked you to. That will do what you want.
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