Fascinating and it sounds doable to me. However, not to my mother in law and most other people I know, which is the group that would require a method like this, but then it should be much easier.
Please not the latter. There are sooo many apps out there where you wonder if it's a honeypot, has more or less functionality, or is a completely different product. All because the name is similar, and the app icon the same or imperceptibly different.
This same argument is made over and over in many threds. I don't understand why this is so hard to understand. Even mobiles and social media were totally new to the older generation but they got used to it. How is this any different ?
Using mobiles/social media is a lot easier to grasp than the steps under "How to do it". Copying files around a mobile file system and building a whole Android application is completely different to what you are talking about.
