artificial harmonic function

[Kieren Richard MacMillan]

[ Lilypond 2.9.5 ]

Hello, all --

Has anyone built their own artificial (string) harmonic function?

Specifically, I'm thinking something like

  \ah { c4 f c'' }

to get the c (stopped note) in the given duration, the f (touched  
node) as a diamond-shaped note in the same chord (i.e., sharing  
stems, flags, etc.), and a small parenthesized quarter note head (no  
stem or flag, regardless of the value of the stopped note) at the  
sounding pitch (here, c two octaves above the stopped pitch).

I suppose I can dig in and build my own, but it seems like this wheel  
must have already been invented!  =)

Thanks,
Kieren.