But at least 3 of the 5 mysteries in the Luminous, Baptism of the Lord, Transfiguration, and the Last Supper do have feasts, the first two by the same names, and the last one, Holy Thursday.
Even the other 2, the first miracle at Cana, is often spoken in regards to the 3 mafestations of Jesus, the first two when the Magi came to visit the infant Christ, his baptism in Jordan, the first miracle at Cana. Also call Ephanny.
The last mystery, the proclamation of the Kingdom of God, for the seasons of Advent and Lent, the two times of the year when we are call to conversion bigtime.
Plus the Luminous mysteries came out about 20 years, though a thin pizza slice in the history of the Church, but still an important part in time. Those mysteries honor the other three.
All your points are good, but I wouldn’t advocate moving any of the relative feasts to early in the Christmas octave—the point of the homily was that far from being out of place, the feast days of the 26th and the 27th complement the 25th by together providing a succinct glimpse at the essential aspects of the economy of salvation.