Nested PianoStaffs - show inner brace only

[William Rehwinkel]

Dear list,

Organ music is typically engraved on three staves with the top two 
connected by a piano brace.

I would like combine all three staves in a PianoStaff (so that all three 
are modified by the piano accidental style) and omit the outer 
pianostaff bracket. However, I was wondering how to show the inner piano 
brace, as shown in the minimal example below.

Thank you in advance,

% --------------------
\version "2.24"

\score {
    \new PianoStaff \with {
        \omit PianoStaff.SystemStartBrace
    }<<
        \new PianoStaff \with {
            \undo \omit PianoStaff.SystemStartBrace % ??
        } <<
            \new Staff \relative c' {c8 des ees f g a b c } % right hand
            \new Staff \relative c' {bes8 aes fis c d e f g} % left hand
        >>
        \new Staff \relative c { \clef bass cis8 d e d c b a g } % pedal
    >> % full PianoStaff
    \layout {
        \context { \Staff \accidentalStyle piano }
    }
}
% --------------------

Happy new year
-Will
--
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|    William Rehwinkel - Oberlin College and     |
|                           Conservatory '24     |
|          william@williamrehwinkel.net          |
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