dashed span bar for ossia

[carbon14]

I have an ossia above a piano staff. The bar lines are joined between staves
by a bar span.

Is there a way to make the bar span a dashed or dotted line, but leave the
bar lines themselves solid?


Here's my example

\version "2.12.4"

\new PianoStaff = main \relative c'' {
  
  \new Staff = "upper" {
    c4 b d c c4 b
    <<
      { d c }
      \new Staff \with {
        \remove "Time_signature_engraver"
        alignAboveContext = #"upper"
        fontSize = #-3
        \override StaffSymbol #'staff-space = #(magstep -3)
        \override StaffSymbol #'thickness = #(magstep -3)
        firstClef = ##f
      }
      { f e }
    >>
    c4 b c2
  }
}

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