GABC TO XML TO MSCZ

I use a python script to convert gregorian GABC files to XML. But the thing is that recent builds have caused confusion in the output. They beams do not correspond to neumes (gregorian notation). On top of that the bars correspond to that of gregorian but once I cut and paste the the notes, they all disappear. I have to cut and paste because the default instrument has confusion with the key (and the transposition) of the piece. I would very much like the output to have the organ as the default instrument but I do not know how to do that. Of course with v3.0 (which I very much appreciate) forces me to redo all my old files. I have included the raw xml file and the final mscz file after much modification.

I would like to know if Musescore would consider implementing GABC directly into the software. I write organ accompaniment for gregorian chant and I would very much like to be able to write the chords directly onto gregorian notations but on the classical 5-line staff to make it easier for organist to read and to transpose the piece...