Anything is possible but this would require a huge amount of labor and money if you want it to work like the factory push button.

Push button starts work with a series of antennas/sensors around the car to detect whether the key fob is outside of the vehicle or inside. The car only starts if the fob is inside the car. If you were to retrofit something it would take much more effort than what it is worth to put those antennas/sensors in. If you didn't, the car could easily be stolen as someone could just press the button, start the car and go.

Push button starts aren't really all they're cracked up to be. I am currently running a Nissan Altima rental that has push button and I dislike it. The other day I was just trying to get it in to accessory mode without actually turning the car on and it was a huge task to try to do something so simple whereas all I would have had to do in my Cruze was turn the key halfway. Keyed ignitions are fool-proof and an ideal thing to have in a car. Factory push button starts have their own set of problems. I can't imagine what kind of headaches a retrofit push button system would cause.

t;ldr It's possible to do it but not worth the time or money just to be able to push a button to start the car.

 

Very true, it was more of a curiousity about simplicity or not. I just hate the giant key for the Cruze, coming from a cobalt its key was much smaller lol

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I tend to agree with LiveTrash on this, but if you were to go ahead, the best bet would be to have a donor car to slowly swap parts with so that you get them all. You would also need a subscription to AllData or another manual.

 

You might look into a retrofit kit. You may have noticed that your key start isn't a "normal" key start. You're simply telling the computer you want the car to start - it does the rest. You can test this by just flicking the key to start and letting it go. You don't have to hold it until the engine catches.

Edit: there is this kit. No idea how well it works. Just something I found in a search.

 

Yeah I was looking into advancedkeys

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It would have to be something that could handle 3 modes.

Running mode
Accessory mode
Service mode

Accessory mode just needs a couple second push. Doesn't turn everything on. Goes off after 10 minutes I think it was.

Service mode requires 5 seconds or something. Turns everything on except the motor. Will stay on till battery goes dead. Or turned off.

I tried it in hopes of using torque to download the pids. Had to keep pushing button every 10 minutes till i found out about the service mode. ONly to find out torque never finishes the process after download is complete.