And in general, did Pharr’s approach catch on for the preparation of student editions of other texts?
Book One, yes: several, which I’ve listed elsewhere.
Book 10: Cambridge Green & Yellow.
Otherwise, not any that I have been able to find.
Yes, in the sense that there are other texts that have a similar format. One author in particular, Geoffrey Steadman, produces many such texts. But other authors also create “Steadmans,” as they are sometimes called.