LilyPond to Finale :-(

[Urs Liska]

Dear list,

I have a very annoying question.
Please don't blame me for anything but just help me or not.

I will have to somehow convert a LilyPond score to Finale :-( and would 
like to know if there is an acceptable solution for the task (well, even 
the task itself isn't acceptable ...)

The background is that I am offered to release a score for a major 
publishing house but they won't use my LilyPond files (which partly 
makes sense because the piece will eventually be published in a Complete 
Edition, and of course it should be the same as the other pieces).
[Of course it is way out of scope trying to talk them into using 
LilyPond for the rest as well. So this is not a usable answer]

I don't have to provide a really printable file, but basically it should 
contain all the music and look somewhat correct.

My idea would be trying to export/import via midi file, so I would have 
at least the notes in Finale. I think the music isn't very complex, so 
this might even work to some extent.

But are there solutions that could transfer more information more 
reliably to a finale file. Probably via some intermediate programs/file 
formats?
I see several more or less working solutions to convert music to 
LilyPond (which is what makes sense...) but not the other direction.

Any help or hints are highly appreciated. If I won't be able to provide 
a Finale file, the edition won't be published :-(

Best
Urs