Using a layered staff with hidden notes, rather than grace notes, gives a bit more flexibility than the grace notes, I think:
!NoteWorthyComposerClip(2.0,Single)
|Clef|Type:Treble
|Note|Dur:32nd|Pos:-3^
|Chord|Dur:32nd|Pos:-3^,-1^
|Chord|Dur:32nd|Pos:-3^,-1^,1^
|Chord|Dur:32nd|Pos:-3^,-1^,1^,4^
|Chord|Dur:4th,Dotted|Pos:-3,-1,1,4
|Note|Dur:16th|Pos:-3^
|Chord|Dur:16th|Pos:-3^,-1^
|Chord|Dur:16th|Pos:-3^,-1^,1^
|Chord|Dur:16th|Pos:-3^,-1^,1^,4^
|Chord|Dur:4th|Pos:-3,-1,1,4
|Bar
|Note|Dur:32nd|Pos:-3^
|Chord|Dur:32nd|Pos:-3^,-1^
|Chord|Dur:32nd|Pos:-3^,-1^,1^
|Chord|Dur:32nd|Pos:-3^,-1^
|Chord|Dur:32nd|Pos:-3^,-1^,1^,4^
|Chord|Dur:4th,Dotted|Pos:-3,-1,1,4
|Note|Dur:16th|Pos:-3^
|Chord|Dur:16th|Pos:-3^,-1^
|Chord|Dur:16th|Pos:-3^,-1^,1^
|Chord|Dur:16th|Pos:-3^,-1^
|Chord|Dur:16th|Pos:-3^,-1^,1^,4^
|Chord|Dur:4th|Pos:-3,-1,1,4
!NoteWorthyComposerClip-End
In the last bar, I staggered the sequence of the chord element entries to see if it sounded more like what I think MIDI Man was asking about. I think it gives a slightly more realistic "guitar picking" effect (but I'm not a guitar player...)