Baroque music does this on a single staff. Here is the basic (ver 2.5+) workaround:
!NoteWorthyComposer(2.5)
|AddStaff|Name:"Staff"
|StaffProperties|EndingBar:Open (hidden)|WithNextStaff:Layer
|Note|Dur:8th|Pos:0z|Opts:Stem=Down,StemLength=1,Beam=First,XNoteSpace=1,NoLegerLines,Muted
|Spacer|Width:0|Color:1
|Note|Dur:8th|Pos:3|Opts:Stem=Down,StemLength=6,Beam=End
|AddStaff|Name:"Staff-1"
|StaffProperties|EndingBar:Open (hidden)
|RestChord|Dur:8th|Opts:Stem=Down,StemLength=6,HideRest|Dur2:4th|Pos2:-6
|Rest|Dur:8th|Opts:Stem=Down|Visibility:Never
!NoteWorthyComposer-End
IMO, NWC should support this directly on a single staff.
Cross staff beaming is unlikely to be directly supported due the the added complexity of how staves interact in NWC.
The attachment from Clair de Lune shows some cross staff beaming that can be acheived in NWC 2.5+
I would like more tools to simplify this but I don't think it will ever become easy. Much of the difficulty in the attachment is the slurs ...