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Edit: Another way would be to change the tuplet bracket like this proposal and one comment suggest. I changed the code from the linked proposal a bit to make the slurs smaller:

Edit: Another way would be to change the tuplet bracket like this proposal and one comment suggest (sorry, I only saw the comment after having edited my answer). I changed the code from the linked proposal a bit to simplify it and to make the slurs smaller:

If you want to temporarily omit the bows, you can use \once \override TupletBracket.stencil = ##f just before the relevant tuplet.

bow-up = \markup {  \with-dimensions #'(3 . 4) #'(0 . 0) 
    \override #'(filled . #t) 
    \path #.1 #'((moveto 0 0)
                 (curveto 1 1.2 2 1.2 3 0)
                 (curveto 2 0.9 1 0.9 0 0)
                 (closepath)) }

bow-down = \markup {  \with-dimensions #'(3 . 4) #'(0 . 0) 
    \override #'(filled . #t) 
    \path #.1 #'((moveto 0 0)
                 (curveto 1 -1.2 2 -1.2 3 0)
                 (curveto 2 -0.9 1 -0.9 0 0)
                 (closepath)) }

#(define-markup-command (tuplet-bow-up layout props tuplet-number) (markup?)
  (interpret-markup layout props
    (markup #:center-column(#:vspace -.2 bow-up #:vspace -.6 #:line(tuplet-number)))))

#(define-markup-command (tuplet-bow-down layout props tuplet-number) (markup?)
  (interpret-markup layout props
    (markup #:center-column(#:vspace .2 tuplet-number #:vspace -1 #:line(bow-down)))))

tupletBowUp = #(define-scheme-function (parser location tuplet-number) (string?)
     #{\override TupletNumber.text = \markup \tuplet-bow-up #tuplet-number #})

tupletBowDown = #(define-scheme-function (parser location tuplet-number) (string?)
     #{\override TupletNumber.text = \markup \tuplet-bow-down #tuplet-number #})

\score {
  { 
    \clef bass
    \time 3/4
    \tupletBowUp "3" \tuplet 3/2 { c8 b, c } \tupletBowDown "3" \tuplet 3/2 { e8 g e } \tuplet 3/2 { e8 g e } c'4
  }
  
  \layout{}
}

bow-up = \markup { \with-dimensions #'(0 . 3) #'(0 . 0) 
    \override #'(filled . #t) 
    \path #.1 #'((moveto 0 0)
                 (curveto 1 1.2 2 1.2 3 0)
                 (curveto 2 0.9 1 0.9 0 0)
                 (closepath)) }

bow-down = \markup { \with-dimensions #'(0 . 3) #'(0 . 0) 
    \override #'(filled . #t) 
    \path #.1 #'((moveto 0 0)
                 (curveto 1 -1.2 2 -1.2 3 0)
                 (curveto 2 -0.9 1 -0.9 0 0)
                 (closepath)) }

#(define-markup-command (tuplet-bow-up layout props tuplet-number) (markup?)
  (interpret-markup layout props
    (markup #:center-column(#:vspace -.2 bow-up #:vspace -.6 #:line(tuplet-number)))))

#(define-markup-command (tuplet-bow-down layout props tuplet-number) (markup?)
  (interpret-markup layout props
    (markup #:center-column(#:vspace .2 tuplet-number #:vspace -1 #:line(bow-down)))))

tupletBowUp = #(define-scheme-function (parser location tuplet-number) (string?)
     #{\override TupletNumber.text = \markup \tuplet-bow-up #tuplet-number #})

tupletBowDown = #(define-scheme-function (parser location tuplet-number) (string?)
     #{\override TupletNumber.text = \markup \tuplet-bow-down #tuplet-number #})

\score {
  { 
    \clef bass
    \time 3/4
    \tupletBowUp "3" \tuplet 3/2 { c8 b, c } \tupletBowDown "3" \tuplet 3/2 { e8 g e } \tuplet 3/2 { e8 g e } c'4
  }
  
  \layout{}
}

\version "2.19.83"

#(define-markup-command (tuplet-bow-up layout props tuplet-number) (markup?)
  (interpret-markup layout props
    (markup #:vspace -1 #:center-column(#:rotate 180 (#:musicglyph "ties.lyric.default")#:vspace -.4 #:line(tuplet-number)))))

#(define-markup-command (tuplet-bow-down layout props tuplet-number) (markup?)
  (interpret-markup layout props
    (markup #:vspace .5 #:center-column(tuplet-number #:vspace -1 #:line(#:musicglyph "ties.lyric.default")))))

tupletBowUp = #(define-scheme-function (parser location tuplet-number) (string?)
     #{\override TupletNumber.text = \markup \tuplet-bow-up #tuplet-number #})

tupletBowDown = #(define-scheme-function (parser location tuplet-number) (string?)
     #{\override TupletNumber.text = \markup \tuplet-bow-down #tuplet-number #})

\score {
  { 
    \clef bass
    \time 3/4
    \tupletBowUp "3" \tuplet 3/2 { c8 b, c } \tupletBowDown "3" \tuplet 3/2 { e8 g e } \tuplet 3/2 { e8 g e } c'4
  }
  
  \layout{}
}

bow-up = \markup { \with-dimensions #'(3 . 4) #'(0 . 0) 
    \override #'(filled . #t) 
    \path #.1 #'((moveto 0 0)
                 (curveto 1 1.2 2 1.2 3 0)
                 (curveto 2 0.9 1 0.9 0 0)
                 (closepath)) }

bow-down = \markup { \with-dimensions #'(3 . 4) #'(0 . 0) 
    \override #'(filled . #t) 
    \path #.1 #'((moveto 0 0)
                 (curveto 1 -1.2 2 -1.2 3 0)
                 (curveto 2 -0.9 1 -0.9 0 0)
                 (closepath)) }

#(define-markup-command (tuplet-bow-up layout props tuplet-number) (markup?)
  (interpret-markup layout props
    (markup #:center-column(#:vspace -.2 bow-up #:vspace -.6 #:line(tuplet-number)))))

#(define-markup-command (tuplet-bow-down layout props tuplet-number) (markup?)
  (interpret-markup layout props
    (markup #:center-column(#:vspace .2 tuplet-number #:vspace -1 #:line(bow-down)))))

tupletBowUp = #(define-scheme-function (parser location tuplet-number) (string?)
     #{\override TupletNumber.text = \markup \tuplet-bow-up #tuplet-number #})

tupletBowDown = #(define-scheme-function (parser location tuplet-number) (string?)
     #{\override TupletNumber.text = \markup \tuplet-bow-down #tuplet-number #})

\score {
  { 
    \clef bass
    \time 3/4
    \tupletBowUp "3" \tuplet 3/2 { c8 b, c } \tupletBowDown "3" \tuplet 3/2 { e8 g e } \tuplet 3/2 { e8 g e } c'4
  }
  
  \layout{}
}