well we COULD do the fancy push button, but you would still need the key as the button would only replace the last function of the ignition, But yea the other expensive do hicky is the suspect part, If you search for ignition switch you see they have a socket on them in the center that's where the rod from the ignition it's self turns it I'm not really 100% how yours works but I/you can easily look it up, there's more info online then in a haynes manual!
aw man no use for the push button then LOL. so thats the suspected part eh? hmm. i should get it and replace it then. what is your weekend looking like