Spoken Vocal Part

I have a vocal line which goes from singing to speaking, so I want to write the spoken section on the vocal stave using ‘ghost notes’; I can see how to do that for percussion parts but not for a vocal. Any suggestions?

I tend to use x-noteheads and then suppress playback.

"For example, to change the notehead design of the selected notes to X noteheads, choose Edit > Notehead > Crosses > X Noteheads."

https://steinberg.help/dorico_pro/v3.5/en/dorico/topics/notation_reference/notation_reference_notes/notation_reference_notes_notehead_design_changing_individually_t.html?hl=x-noteheads