Incipit with default noteheads possible?

[Hajo Baess]

Hello all,

I am typesetting a piece where the violin plays in a different tuning.
Of course you have to indicate the tuning before the music starts. I
would like to implement this with the \incipit command, if possible,
but there is one downside: you get your notes in the incipit with
mensural noteheads. I have tried an override ( \override
Staff.NoteHead.style = #'default ), but this does not seem to work.

Here is my code example:

\version "2.24.2"
\language "deutsch"

Incipit = \relative c'' {
        \clef treble \time 4/4
        \omit Staff.TimeSignature
        \hide Stem
        %\mark "A D FIS CIS"
        \override Staff.NoteHead.style = #'default
        < a, d fis cis' >

}

noten =  \relative c'' {
        \clef treble \key f \major \time 4/4
        c4 d e f \bar "|."
}

\score {

        \new Staff
        <<
                \incipit \Incipit
                \set Staff.instrumentName = "Violino discordato"
                \noten
        >>


        \layout {
                indent = 4\cm
                incipit-width = 1\cm
        }
}

Do note-head styles just not work with \incipit, did I miss something,
or is there a way to obtain the desired result?

Any suggestions are greatly appreciated...