Hello Paul,

Such things are quite difficult to handle by default, and usually there is a 
better way to notate this. So in the end you probably cannot do this without 
hacking. I’ve appended a variant I could live with, maybe this is what you 
want.

Cheers,
Valentin
\version "2.23.3"

\language english

global = {
   \accidentalStyle dodecaphonic-no-repeat
   \override Beam.concaveness = #3
   \override TupletBracket.bracket-visibility = ##t
}

IpriRH = \relative d'' {
   \clef treble
   \time 2/4
   \global
   s4
     \set tieWaitForNote = ##t
     \tuplet 3/2 { \voiceOne \change Staff = "priLH" af,8
                   \change Staff = "priRH" << {
                     \once \override Tie.extra-offset = #'(0.0 . -0.5) 
f'~ g_-~}
                   \new Voice {\stemDown f4*2/3_- \stemNeutral} >> } |
   <f g>4..
     \set tieWaitForNote = ##f
     \oneVoice s16 |
}

IpriLH = \relative c {
   \clef bass
   \time 2/4
   \global
   s4 af'4_-_~ |
   << { \voiceOne \crossStaff \tweak Dots.extra-offset #'(2.85 . 0)
        \tweak Dots.X-extent #'(0 . 0)
        af4.. }
      \new Voice { \voiceTwo
                   s32 a4..*13/14^- 
} >>
     \oneVoice s16
}

\score {
   <<
     \new PianoStaff <<
       \set PianoStaff.instrumentName = #"Primo"
       \new Staff = "priRH" { \clef treble \IpriRH }
       \new Staff = "priLH" { \clef bass \IpriLH }
     >>
   >>
   \layout {
     \context {
       \PianoStaff
       \consists #Span_stem_engraver
     }
   }
}

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