Fantastic idea. I love the displacement activities you have identified. I can add a couple more that I'm doing:
Grown up colouring in. You can print detailed pictures off the Internet. Colouring is incredibly meditative!
Google unusual walks in London. I've discovered so many new places and quirky things. My fave so far was the '7 noses of soho' walk. I only found 4!
Good luck with your journey. I have not felt like drinking yet, but I plan on coming straight on SR if/when I do. This place is a life saver.
S x