Regarding number 7, this has been done already.
As the copyright holder is marked S. A. la Froidfontaine that appears to be managing the temporal affairs of Solesmes. Since they do not claim the more recent melodies any more then apparently the only copyrighted matter remains the placement of episemes.Omnia jura vindicabuntur in universam nostram excogitandi scribendique rhythmi rationem. Desclee & socii
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