Thanks. As noted, Rick's solution reverses the note pitches and positions. I was already layering an Alto part, so I came up with this: Layer 1:
!NoteWorthyComposerClip(2.0,Single)
|Chord|Dur:Half,Dotted,Slur|Pos:-3|Opts:Stem=Down,StemLength=0,ArticulationsOnStem|Dur2:Whole|Pos2:-2^
|Note|Dur:4th,Slur|Pos:-4^|Opts:Stem=Up
|Bar
|TempoVariance|Style:Fermata|Pause:0|Pos:9|Justify:Center|Placement:AtNextNote
|Chord|Dur:Whole|Pos:-4,-2
!NoteWorthyComposerClip-End
Layer 2:
!NoteWorthyComposerClip(2.0,Single)
|Chord|Dur:Half|Pos:-3z|Opts:Stem=Up,XAccSpace=1|Dur2:Whole|Pos2:-7^
|Rest|Dur:Half|Opts:Stem=Up|Visibility:Never
|Bar
|TempoVariance|Style:Fermata|Pause:0|Pos:9|Justify:Center|Placement:AtNextNote
|Note|Dur:Whole|Pos:-7
!NoteWorthyComposerClip-End
But in reviewing it to post here, I just realized, when layered, it will look ok. But the stem in Layer 2 (a headless note in the chord) is going to sound in layer 2. I don't want that. (You can't mute one note of a chord, can you?) I guess I need a note stem for layer 1 that I can add as text. Is there a font and character which will give me a stem which will a) align with the note head, b) match the other stems in length and thickness, and c) be common enough to be on everyone else's computer?