It worked nicely. Using multiple voices in one staff, I could set the chords where they needed to be. The only sticking point is that I still can’t set chords across staves, which strictly speaking might be against standard practice for all I know.
So it’s Musescore well ahead of the competition (Lilypond). I can’t believe a free piece of software has so much functionality in it, including the MIDI synth. It’s really wonderful. I’m pondering putting my other stuff in there now.