[fiddlosopher]

Oh, but there is!

    pandoc --shift-heading-level-by=-1 input.md -o output.docx

This will promote level-2 headings to level-1, and promote a level-1 heading at the top of the document to the document's title.

[Veen]

Oh really? I've tried --shift-heading in the past and it worked to move headings up a level, but not to the title. I'll have to read the docs more carefully and give it another go. Thank you.