Tuplet bracket and change staff

This snippet shows how to set a tuplet starting in a lower staff and finishing in the upper one.

\version "2.24"

aigues = \relative c' {
  \time 6/8
  s4. \stemDown c16[ bes' e] \stemUp g c e \stemDown |
  g8
}

basses = \relative c {
  \time 3/4
  \clef F
  \tweak positions #'(4.5 . 8.5)
    \tweak edge-height #'(1 . -1)
    \tuplet 7/6 { c16[ bes' e] \change Staff = md \stemUp g[ c e g] } s4. |
  s8
}

\new PianoStaff \with { \omit TimeSignature }
<<
  \new Staff = md \aigues
  \new Staff = mg \basses
>>