Removing brace on first line of piano score

This snippet removes the first brace from a PianoStaff or a GrandStaff, together with the clefs. It may be useful when cutting and pasting the engraved image into existing music.

The code uses \alterBroken to hide the brace delimiter at the beginning.

\version "2.24"

someMusic =  {
  \once \omit Staff.Clef
  \once \omit Staff.TimeSignature
  \repeat unfold 3 c1 \break
  \repeat unfold 5 c1 \break
  \repeat unfold 5 c1 
}

\score {
  \new PianoStaff
  <<
    \new Staff = "right" \relative c'' \someMusic
    \new Staff = "left" \relative c' { \clef F \someMusic }
  >>
  \layout {
    indent=75\mm
    \context {
      \PianoStaff
      \alterBroken transparent #'(#t) SystemStartBrace
    }
  }
}