Split ambitus engraver?

[David Kastrup]

Hi,

I use Lilypond to make diagrams of all the available notes on an
accordion.  For that I use a single system and switch from bass clef to
violin clef (and it would also be feasible to use 8va and 8ve
modifiers).

Now the problem is that the ambitus is engraved using the first clef of
the system, in this case the bass clef, and the upper range is just
somewhere in the clouds.

In this case it would be nicer if the ambitus were engraved with the
actually used clefs for upper and lower range, so that one first depicts
the lower part of the range (presumably with a dotted line at the top of
the broken off ambitus line a bit above the system to indicate it
reaching higher) with its original clef in smaller size, and then the
upper range of the ambitus with its original clef in smaller size (with
a corresponding dotted line pointing downwards to indicate it reaching
some indefinite distance lower).

If that is not comprehensible, I can try making a sketch and
photographing it.

-- 
David Kastrup