In episode 35, I believe, David and Don got into an exchange about converting from Markdown to HTML or .docx. There were several methods and tools mentioned, but one that was omitted was Ulysses, an editor that runs on MacOS and iOS. Not long ago I “discovered” the enhanced Cut and Paste commands right there in the menu. I was intrigued by “Paste From”, which allows one to have HTML or RTF in the clipboard and “paste from” that format directly into Markdown in Ulysses. The “Copy As” command will let you select Markdown text in Ulysses and copy it to the clipboard as HTML, plain text, or RTF.
I write Markdown in Ulysses, and when I am satisfied with what I’ve said and how it looks (using the Preview command), I Copy As RTF and paste it into Nisus Writer Pro, where I do my final formatting. From there I output either to .docx or to PDF. Sometimes I want to take something from RTF and work on it, or have it close at hand to copy from in Ulysses, so I copy it in Nisus, and then Paste From RTF into Ulysses.
I’m surprised that you seem unfamiliar with Nisus Writer Pro. It comes with a very robust macro language built in so that you can do nearly any kind of text manipulation with it. I’m a neophyte in the macro language, but I managed to cobble together several macros I use to extract text from a document with numbered chapters, paragraphs, and sentences (like most Bibles) and automate a properly formatted reference (e.g. John 3:16, although in my case they look like T-25.VI.4:3–7). It comes with dozens of pre-written macros you can learn from. I’m sure you, David, or you, Rose, could find many uses for it.