Question on creating an "ossia" with different times?

[Wim van Dommelen]

Hi,

I'm trying to create an alternative Staff ("ossia") with a changing of  
the times. I didn't succeed. I'll try to explain with this example.  
(simplified with all my rubbish deleted, just the basic notes left:-):

\version "2.10.0"

\paper {
        #(set-paper-size "a4")
        #(define dump-extents #t)
        indent = 0\mm
}

BCLOne = {
        \relative c' {
                \time 3/2
                c c d d es es |
                e e fis fis g g |
                \time 1/4
                r |
                \time 4/2
                c, c d d es es e e |
                \time 1/4
                r |
                        \break
                \time 3/2
                r c d d es es |
                \time 4/2
                e, e fis fis gis gis a a |
        }
        \bar "|."
}

BCLTwo = {
        \relative c' {
                \time 3/2
                c c d d es es |
                \time 2/2
                e e fis fis |
                \time 3/4
                g g r |
                \time 3/2
                c, c d d es es |
                \time 3/4
                e e r |
                        \break
                \time 3/2
                r c d d es es |
                \time 4/2
                e, e fis fis gis gis a a |
        }
        \bar "|."
}

\book {
        \score {
                {
                        \override Staff.TimeSignature #'style = #'()
                        \override Score.BarNumber #'break-visibility = 
#end-of-line-invisible
                        \clef violin
                        \key d \major
                        \BCLOne
                        \break
                        \BCLTwo
                }
                \layout {}
        }
}

If you run this you will get twice 7 measures. What I want and tried  
is to put these two on top of each other. All notes are quarter notes,  
the total length of the pieces is exactly the same, and if you write  
it out manually you can put it so that for example the third quarter  
of measure 10 exactly fits on measure 3. The same happens a few bars  
further on.

Now mixing it gets me in trouble for the change of the time (2/2, 3/4)  
which has a global result. Either I'm misinterpreting it, or I just  
don't understand how to do it.

Anyone who can help me with a solution? (or just tell me we just  
can't, that's fair enough!)

Regards,
Wim van Dommelen.