Arpeggio Glyph again

[Lilly]

I wanted to write some rhythm guitar and for that i'm using the
\improvisationOn command to switch to slash note heads.
For a particular pattern with "rasgueado" tecnique, i need to display the
arpeggio glyph, but as you know it needs at last two notes in a chord to
display, and instead i'm writing only rhythms as single note, and using:
    \consists "Pitch_squash_engraver"
    squashedPosition = #-2
to display the slash vertically aligned in the position i want.
The solution found in the other post i was not able to make to work.
I wanted to use the arpeggio glyph in the Feta fonts, and use it with markup
command, but i was not able to find.
I'm thinking i should switch the way to write rhythms with chords (in effect
the real thing is just that), but anyway i want to engrave only one slash
with arpeggio near it.
If you compile the "other post" code, you will obtain 2 or more slashes with
an arpeggio on side. One slash is more than enough :) 

I have a headache for now, and hope someone can give me an help :)

thank you in advance
Luigi



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