With version 2.1 this is easily achieved with layering and restchords:
Staff 1 (muted):
!NoteWorthyComposerClip(2.0,Single)
|TimeSig|Signature:4/4
|RestChord|Dur:32nd|Opts:Stem=Up,ArticulationsOnStem,HideRest|Dur2:Half|Pos2:0
|RestChord|Dur:32nd|Opts:Stem=Up,ArticulationsOnStem,HideRest|Dur2:Half|Pos2:2
|Rest|Dur:16th|Visibility:Never
|Rest|Dur:8th|Opts:Stem=Up|Visibility:Never
|Rest|Dur:4th|Opts:Stem=Up|Visibility:Never
|Rest|Dur:Half|Visibility:Never
|Bar
|RestChord|Dur:32nd|Opts:Stem=Up,ArticulationsOnStem,HideRest|Dur2:Half|Pos2:1
|RestChord|Dur:32nd|Opts:Stem=Up,ArticulationsOnStem,HideRest|Dur2:Half|Pos2:3
|Rest|Dur:16th|Visibility:Never
|Rest|Dur:8th|Opts:Stem=Up|Visibility:Never
|Rest|Dur:4th|Opts:Stem=Up|Visibility:Never
|Rest|Dur:Half|Visibility:Never
|Bar
!NoteWorthyComposerClip-End
Layered with staff 2 (sounding):
!NoteWorthyComposerClip(2.0,Single)
|TimeSig|Signature:4/4
|Note|Dur:32nd|Pos:0z|Opts:Stem=Down,Beam=First
|Note|Dur:32nd|Pos:2z|Opts:Stem=Down,Beam=End
|Note|Dur:32nd|Pos:0|Opts:Stem=Down,Beam=First|Visibility:Never
|Note|Dur:32nd|Pos:2|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:0|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:2|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:0|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:2|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:0|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:2|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:0|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:2|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:0|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:2|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:0|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:2|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:0|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:2|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:0|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:2|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:0|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:2|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:0|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:2|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:0|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:2|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:0|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:2|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:0|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:2|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:0|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:2|Opts:Stem=Down,Beam=End|Visibility:Never
|Bar
|Note|Dur:32nd|Pos:1z|Opts:Stem=Down,Beam=First
|Note|Dur:32nd|Pos:3z|Opts:Stem=Down,Beam=End
|Note|Dur:32nd|Pos:1|Opts:Stem=Down,Beam=First|Visibility:Never
|Note|Dur:32nd|Pos:3|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:1|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:3|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:1|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:3|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:1|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:3|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:1|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:3|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:1|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:3|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:1|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:3|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:1|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:3|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:1|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:3|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:1|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:3|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:1|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:3|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:1|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:3|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:1|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:3|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:1|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:3|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:1|Opts:Stem=Down,Beam|Visibility:Never
|Note|Dur:32nd|Pos:3|Opts:Stem=Down,Beam=End|Visibility:Never
|Bar
!NoteWorthyComposerClip-End
The only downside is that the beams reach the stems. Strictly speaking the beams should be short of the stems, but I can live with this. If required some creative "digital whiteout" could be applied