Change appearance of the SpanBar

[tiM Sportny]

Hi,

Does anyone know whether it's possible to manually force a SpanBar to appear as 
"|"? I've added a (reduced) example of my source below to put my question in 
context.

Thanks a lot!
tiM

P.s. I'm new to lilypond as well as to being a participant of this list. Feel 
free to point out if i don't comply to the (social) rules that apply to this 
list!

\version "2.12.0"

\score {
    \new StaffGroup <<
        \new Staff \relative b
        {
             R1 
             \bar "|" \repeat unfold 4 {b8 c} \bar "|"
             \repeat unfold 28 {b8 c}
        }
        \new Staff \relative b
        {
            R1 
            <<
                \bar "|" {b4 b b b} \bar "|"
                \new Staff \relative b
                {
                    \bar "|:" b2 b2 \bar ":|"    
                }
                \new Staff \relative b
                {
                    \bar "|:" \repeat unfold 8 {b8} \bar ":|"    
                }
           >>
            \repeat unfold 28 {b4}    
        }
   >>
        
    \layout {
      \context {
        \Score
        \remove "Timing_translator"
        \remove "Default_bar_line_engraver"
        \remove "Bar_number_engraver"
        
      }
      \context {
        \Staff
        \consists "Timing_translator"
        \consists "Default_bar_line_engraver"
      }
    }
}
                                          
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