You can force an accidental just by adding it to the note. It will display without the need for a grace note. The grace note helps when auditing accidentals.
If you do not need the audit tool, a true courtesy accidental can be placed as text, as shown:
!NoteWorthyComposerClip(2.5,Single)
|Text|Text:"(f)"|Font:StaffSymbols|Pos:3|Wide:Y
|Spacer|Width:50
|Note|Dur:4th|Pos:3
!NoteWorthyComposerClip-End
So, your example:
!NoteWorthyComposerClip(2.5,Single)
|Clef|Type:Treble
|Key|Signature:C|Tonic:C
|TimeSig|Signature:Common
|Note|Dur:4th|Pos:1
|Text|Text:"(e)"|Font:StaffSymbols|Pos:0|Wide:Y
|Spacer|Width:25
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:-1
|Note|Dur:4th|Pos:-2
!NoteWorthyComposerClip-End