I understand your question now. I did not see anything in the factory programming that would suggest that this function is available.

The function is turned on by a telegram sent over the iBus from the IHKA and that activates the residual REST operation. Such a telegram can be sent by an external aftermarket (self-made) module that connects to the car's iBus.
For example, the StealthOne module can "press" the "ACCEPT" button on your behalf, thus eliminating the annoying screen from Nav display.

I do not have a box like that, nor can I make one - but there are people out there who have accomplished similar tasks - check the iBus Hackers on the yahoo groups - the folks there use Melexis IC chip (or Ressler iBus adapter) to connect to the iBus and use a computer (old laptop), that listens to the traffic on the iBus, and sends out pre-programmed commands if specified criteria is met....
For example, you can have your laptop listen for the ignition turning off, and then, in a couple of seconds the laptop would send "REST" command, thus activating your function...

I am not aware of any other way of achieving your desired results...