I have to disagree about “Smart Notes” containing no directions of the proper procedures and, more importantly, the principles behind an effective process for creating and maintaining a slip box. I actually thought it was fairly explicit, but just nested amidst lots of anecdotal fluff and details geared more towards providing context and entertainment (which if your book is about note taking, is quite the task). Anyway I mention it only because it might prove useful to fish through it again for the workflow prescriptions.
Also, you bring up a good point about the “Folgezettel” and the dispute over its ultimate importance to the essence of a zkn system. I have to admit, after obsessing over whether or not maintaining the sequencing of zettels is critical or not, with no definitive answer in sight , I too don’t really care and that.
Finally, as far as note templates go, the best I could come up with on my own in Sublime Text and the Archive was a few keyboard shortcuts; for fleeting, Lit., Index, project, synthesis notes, etc. This did the trick for the most part.