Hi @bryan - nice to have you back. I’m glad you mentioned this as a use case and I want to add my support to the idea — it’s been something I’ve been wanting to pursue for a few years now (since 2016) but haven’t been able to carve out the time. I thought a button to copy a page/book could be also be the first step in an onboarding process if the user wasn’t already authenticated in the PB system. If it’s helpful, and (hopefully) still relevant, I did write an overly wordy blog post about Stigmergic Collaboration (inspired by your very own David Wiley) and tried to flesh out some of the workflow details to address a very similar use case https://github.com/BCcampus/pressbooks-textbook/projects/2
Also somewhat relevant, though I would caution against counting on this being robust, is the search and import feature in Textbooks for Pressbooks which uses the PB API v1 to search for, and then import individual pages. It was meant to serve an already authenticated user, and needs a lot of update love, but the proof-of-concept is there. Certainly building on top of PB API v2 is going to deliver the best long term results.