Thank you, but your links to another Meta thread appear to suggest workarounds that aren’t much better than simply composing my thoughts entirely off Discourse in a third-party text editor.
Thank you also for directing me to a list of my saved drafts. I did not know those existed, I don’t know how they were created, and it seems now I have many drafts from over several months to delete individually (or is there a way to delete them all at once?). Additionally, this still doesn’t provide a solution to this bug I seem to have encountered, in that I can’t draft two threads at once.