Hey, Functionmunchkin.
The “Add to home screen” functionality has been added to my WordPress site, which can be found on GitHub.
However, all the functionality described in this series is pushed together in the single repo, so it might be a challenge to find just the parts you would need to add it to your site.
That said, the article does walk through everything you would need, so that might be the best way to go…
Atg