there comes a point when one is adding citations to the footnotes list in the outline where one wonders "maybe this just shouldn't exist". that point might be at around entry number 50
@glyph There is one blog I follow¹ where three-part series regularly transform into things such as 'I, II, IIIa, IIIb, Intermission, IVa, IVb'. He even also has footnotes. As someone who periodically starts writing one entry only to discover I need N more, I have great sympathies.
¹ https://acoup.blog/ , home of much fascinating information on a wide range of ancient history and adjacent things, including a fascinating analysis of battles in LoTR.