Its easier than that :-)
Put 06/09 or 01/10 firmware on the COMAND, and it has the ability to display lines in-built.
06/09 displays lines for ML/GL/R (i.e lines not so perfect on other models) - I think 01/10 may support more but I haven't checked.
Obviously developer mode Star diagnosis is needed to turn this on, and Star diagnosis is needed to update the system.
R
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