Workaround for issue 4633?

[Simon Albrecht]

Hello,

does anybody have an idea how to work around issue 4633 
<https://sourceforge.net/p/testlilyissues/issues/4633/>? The problem is 
that the MMR should use the same glyph as `r\breve`, but it doesn’t iff 
the staff is explicitly instantiated _and_ Timing_translator is moved to 
Staff level. I don’t know of any way to override this glyph choice…

Thanks in advance,
Simon

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