trying to reproduce unusual time signature

[Kim Shrier]

I am re-typsetting a piece from a modern (1950’s) edition
of some 14’th century music, in order to make it easier to
read and play from.  It has a time signature that looks like:

     3
2 x -
     4

Is there some way to do this in lilypond?

It looks like I could write a scheme function to do this but
I wanted to make sure I haven’t missed something that
already exists before I embark on that.

Thanks,
Kim