I use a 7" touchscreen Pi as a “desk assistant” running MagicMirror. I keep a scrolling calendar for the day on one half, and I rotate the other half through a bunch of panels using mmm-carousel.
You can simulate a lot of what this Google device does, however, it’s likely to be quite hard to get the touchscreen working in a similar way. Swiping, tapping, etc, bringing up a keyboard - these are all things Android does very seamlessly and easily. MagicMirror just doesn’t have the support for those, unfortunately.
I spent some time trying to get some gestures to work - I wanted a “double-tap” to turn on and off the screen - but wasn’t really able to make much progress because the basic support for it in electron just wasn’t there
But good luck on this project, I think this is a worthwhile goal and I’ll be following your progress