Moving clef changes into the bar they affect

[James Worlton]

Hello,

I'm trying to create a quiz for a Theory class, and I'm having 
difficulty with clef changes. Normally, new clefs appear before the 
barline of the bar where they take effect. I'm trying to move the clef 
changes into the relevant bars.

This code shows the standard musical practice, with the clefs before the 
barlines.

\version "2.19.13"
\score {

   \new Staff {

     \omit Staff.TimeSignature

     \omit Score.BarNumber

     \override Staff.Clef.full-size-change = ##t

     \clef treble

    s1

    \clef bass

    s1

     \clef alto

     s1

  }

}


I've been trying to find the relevant properties of clefs in order to do 
this, but not having any luck. Is there a way to do this?

Thanks,
James Worlton