How to display timesig.C22 on 4/2 instead of 2/2

[William Rehwinkel]

    Dear list,
      
      I am having trouble finding the source code which displays the
      glyphs timesig.C44 and C22 in place of 4/4 and 2/2 time
      signatures.
      
      The reason is I would like to override this so that timesig.C22
      displays on 4/2 time signature for early music which uses the brevetactus.
      I know this could be done with substituting a text-interface for
      the time signature stencil, but it would be nice if I could put
      this in my style-sheet and "set and forget" it.
      
      Thank you,
      -William
    
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