Since my OP we have the car in hand - in the garage. As it turns out, all the subscriptions that I can find are in force for about a year, except perhaps Sirius that I have not looked into yet.

Stuff like BMW Assist. I did converse with BMW SOS.

I have what I think is a quality battery charger. I understand that running the electronics without the engine for hours while I study and fiddle can significantly deplete the battery (I think there is a caution in the owners manual). Is it OK to hook-up the charger under the hood while I study?

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Believe nothing read or heard without verifying it oneself unless it, Weltanschauung congruent, fits ones worldview.