Irregular "9-tuplet" tremolo notation

[u_li]

Dear community,

I have an unusual tremolo notation to typeset with LilyPond:
http://old.nabble.com/file/p28502145/tremolonotation_2.jpg
tremolonotation_2.jpg 
The first part of the bar shows the real notes, the second part the
shorthand notation Webern used for the rest of the score.

With
  \repeat tremolo 3 { cis g } 
I can typeset the note-heads, stems and beams correctly, but not the "9" -
and of course it would still be different music with different midi-output
(straight 8ths instead of triplets).

Is there a way to produce such an irregular tremolo (ending on the initial
note)?

Thanks in advance
Urs
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