a while ago I played with making Moodle books available to non-Moodle users. This resulted in creating a spreadsheet with links and a custom Moodle theme that removes all non-essential things such as headers, footers, menus etc. In this example, you click a link in Google spreadsheet and hop over to a Moodle site, login as guest automatically and access the book.
I am curious what you think of this approach!
Click any link to jump into the resource.
What is looks like:
Google sheet. Resources organized by subject matter:
What it looks like after clicking a link. The resource: