I would also be very interested in adding Romansh to this project. Is it possible to consider the different types of Romansh as seen in the IANA / BCP-47 subtags?
It is worthwile to mention the types of Romansh are vastly different (grammar, syntax, spelling, pronunciation) and cannot be covered as a single language with "variants". There are already experiences in this matter both from the academic sector (Computer Linguistic of the University of Zurich) and the private sector (Supertext.com, Recapp.ch). It is therefore important to consider these take aways. The representation of the Romansh idioms as "varieties" in IANA might be misleading in this case.