The e-Manager system does not exist in the USA model year 2015 head unit's software. I cannot think of a way to get this working by changing components. You would probably have better luck figuring out what changes in the car's computer parameters when the schedule is changed. OBD software tools could probably poke in a new schedule in the same manner as the CarNet communication module. I think that is your best bet. However, it would probably require comparing scans of a car that currently has the ability to change the schedule by CarNet.
In the best case, someone could develop an app to communicate to a Bluetooth OBD adapter to poke in the required parameters to change all the features like charging schedule, pre-climate schedule, charging current, Min Battery Level, Max Battery Level, etc. However, it's a big development effort that very few people are motivated to undertake.