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.

It uses \alterBroken.

\version "2.24.0"

someMusic =  {
  \once \override Staff.Clef.stencil = ##f
  \once \override Staff.TimeSignature.stencil = ##f
  \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
    \context {
      \PianoStaff
      \alterBroken transparent #'(#t) SystemStartBrace
    }
  }
}

\paper { tagline = ##f }