[Charles Henrickson]

This is the usual Protestant lineup (splitting the Catholic I into I and II and merging the Catholic IX and X into X)

Well, the Lutherans number them like the Catholics do. I figured the Anglicans/Episcopalians, being more of a historic, liturgical church also, would do likewise.

[AnAmericanMother]

But for the rather strong feelings of the advisers of Edward VI (and to a lesser degree Elizabeth I), they probably would have.

But it used to be (pre-1970s) called "The Protestant Episcopal Church in America" for a reason. We 'high-churchers' mostly ignored that, as well as certain of the XXXIX Articles (especially XIX, XXII, XXV, and XXVIII) but there you are.