How to get Glissando in front of a note

[Frank Steinmetzger]

Hello list,

I am trying to produce glissando marks as seen in original.png. My idea was to
use hidden grace notes as start note, but unfortunately, the result is not
very good, as seen in result.png. There is overlapping with the time
signatures, and mid-measure the grace notes are too close to the note to be of
any use.

Could you give me a nudge, please? (Parallel hidden voices? postscript-fu?)

I attached a minimal example containing the code of my original score, from
which result.png was captured.
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original.png
Description: PNG image

result.png
Description: PNG image

glissando.ly
Description: Text document