For one, the Carmelite order, by reason of its origin and its proximity to other oriental rites, carries a feast of Saint Elias. Similarly, the Latin Patriarchate of the Holy Land boasted a slew of idiosyncratic feasts and votive Masses of the Passion of Christ and of Old Testament saints. One such feast, which I spent years vainly essaying to find and which Marco related to me from a monk of Silverstream, is that of Saint David the King, Prophet and Confession.
The texts of his Mass, celebrated with the comites Christi on December 29th with a commemoration of Saint Thomas Becket of Canterbury, emphasize the auditory relationship between God and David. The Introit is Cantate Domino canticum novum. More interesting is the Collect:
Deus, Pater omnipotens, qui per os David in Spiritu Sancto tuo hymnos cantare fecisti; tribue, quaesumus, ut euis intercessione digne sacrificium laudis perficere valeamus. Per Dominum nostrum.....The lesson, from 1 Kings (1 Samuel), recounts Samuel finding David tending his father's sheep and anointing him king, receiving the spirit of God which had just left Saul. While this pericope seems an obvious choice for the feast of Saint David the King, it is hardly the only plausible choice. The time of its celebration, within the octave of the Nativity, doubtless made the kingly anointing of a poor, modest shepherd tending his father's flock a more fitting example of typology than the battle with Goliath.
Herein is an interesting example of how additional Scripture and feasts could be extended to the older liturgy without disrupting its internal integrity with the insertion of a disjointed three year lectionary: make the Missae pro aliquibus locis more broadly available, even if only as votive Masses for one particular day a year. Perhaps in fifty years a consensus approach to such Masses would warrant an updated version of the older kalendar. Many of these Holy Land votive Masses or unique feasts have Scriptural pericopes unrelated to the Commons which dominate the baroque French and Italian saints whose feasts squeezed all sense of the ferial from the kalendar and made the late Tridentine Office into the "rite of Iste Confessor."
Additionally, many saints got on the kalendar early because of feasts associated with the translation of their relics. That is certainly true of numerous Apostles. Since that is now rarely the case, the old liturgy could prove its vivacity in testing the faithful's openness to devotion to Old Testament saints. At the very least the typology, especially when exercised with discretion as the Patriarchate of Jerusalem did in writing the Mass of King David, may enrich understanding of Christ and the saints under the new and eternal Law.