of course, if you had all the time, money, and bill gates for programming the system, then i think it is possible, but not for the average hobbist..
i don't know what other options your looking for..
i do not believe there is any way to add screens to the factory nav system.
lockpick is a different type of solution-- it allows you to watch movies while in motion, and also unlock other functionality that is normally disabled.
these devices serve 2 different functions:
mimics is intended to be used with a iphone where you can generate the screen--the mimics only deciphers the touch signal, and doesn't do anything more-- so the iphone screen would be shown on your lilliput screen, which would be connected to the mimics unit to allow you to press buttons-- you are dealing with the iphone interface.
lockpick can control your ipod/phone, but does not give you access to the actual ipod/phone interface. it grabs the media off of the device, and allows you to play it.