This seems to integrate galleries and inline insert but is not intuitive or straightforward and is going to need much investigation and experimentation to understand and document.
And a weekend later I am not much the wiser! And there is a severe lack of documentation on this as an option.
And then somehow I’ve cracked it. Unfortunately no clear idea how. Something to do with node gallery content types?
What is clear is that placing images inline and creating galleries are two separate workflows. Both seem simple enough. I just need to crack floating images to the right of text for Lynne to place them in poems and recipes.