About the first part of that section, users will have the APP already installed for going to that flow so that’s not an issue.
I’ll see if I can try the second suggestion →
Instead of linking to example://path/into/app, you could link to https://example.com/redirect-to-app.html and redirect-to-app.html would contain the following code:
Thanks for pointing to this, I’ll get back here with my findings.