Io ha trovate iste suggestion al pagina
http://humanities.uchicago.edu/forms_unrest/FR-ENG.html
e io lo pone al vostre attention.
Ciao,

Mario Malaguti

Accent Representation 
The default keyboard representation of accented characters in X-Mosaic,
running
under the UNIX operating system, is made up of two character strings with the
vowel followed by the appropriate symbol. These are

grave = back slash.  Example: à --> a\
aigu = forward slash.  Example: é --> e/
circonflexe = caret.  Example: ê --> e^
cedille = comma.  Example ç --> c,
trema = double quote.  Example  ö --> o"