As much as I'm not a fan of their products, there is very little you can do to help users when they (by proxy in this case) ignore or avoid your attempts to help them.
Making the option easier to find after on-boarding might help, but for the users you describe it would need to be very easy to access and you will fill any list of quick-access options very quickly if you include things they may only want to use one or twice in the life of the phone rendering the "quick access" a big scary list that is neither quick nor easy. Even if you do find a good place for the option: will that class of user even know to look for it never mind find it? They'd just ask the person who on-boarded them instead so the technical level of the target audience has changed back to someone who at least knows how to Google for where to find a more buried option.