Welcome to AF!
No need to post duplicate threads, the other has been deleted.
As for the security issues your BCM works in conjuction with the PCM and the lock cylinder to start the car.
You can buy a remote start kit but you will need the BCM and PCM connected.
The only other way is to buy or make a wire harness that will start and run the engine with out the other components, like an older none computerised automobile. Though you'll still need some sort of PCM to control your engines air/fuel mix and timing, it just wont work with out something monitoring these.
Good Luck!