Those are some important principles. Recently, I’ve been thinking about following this method in a completely different context.
Using a privacy-respecting phone is entirely doable as long as you don’t need to interact with certain parts of the modern world. In 2010, such problems didn’t exist, but mobile Linux wasn’t available for this kind of use. Nowadays it is, but the world around it has moved on, and what’s required for a daily driver of a normie has changed radically.
So here’s how to adapt: Get some basic Android phone and use it for doing the few necessities that don’t work on a FOSS-based phone. That Android is just a skeleton. There’s nothing too personal, and you don’t use it for anything unless absolutely necessary. Same as that Gmail idea, but adapted.