Rob, you’ve missed my point. I’m suggesting that you could put the text in a flow heading, preferably using tokens. If you want it to appear in the layout at all, you need the Tacet turned on.
Here, for instance, Tracks 37 and 38 (which may or may not be flows 37 and 38) are actual flows, but contain no music. There are hidden tacets and the titles and cues are inserted automatically using tokens.
There is a limit to how large Flow Headings can be, I believe, and there’s no way of linking a text frame to a specific flow. This may be a non starter.