We cannot pick and choose which parts of the Mass we will sing. This is permitted during a low Mass where the celebrant is in no way involved, and such singing does not disturb the rite of Low Mass. If, however, the celebrant is to sing at all, we are immediately governed by the rubrics pertaining to a solemn Mass. Everything which is sung in a solemn Mass MUST also be sung in a Missa Cantata, including the Proper.
Orthodox Canon law is like, one thin book (compared to the encyclopedia set of Roman Canon Law). While the Latin Rite tries to account for every exception in its canon law, and can therefore turn very simple questions into intense quote wars, the Orthodox church isn't like that...
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