German notation

[Wim van Dommelen]

I encountered a piece written in so-called "German notation"  and I want to 
play it properly notation (which is "French"

I can do the basic transposes but the key is always interfering and produces 
strange results.

Is there a quick Lilypond recipe to convert this (from "German" to "French" 
written) ?

Thanks,
Wim van Dommelen