I reported earlier on how we do it at St. John’s Abbey during this time of no congregational singing. Here are some resources and some samples.
Theodore Marie’s recto tono Gloria, nicely revised by Clint Kraus, is here. It also works well with everyone reciting the text. It is in the public domain.
Here is the Responsorial Psalm for the coming Sunday. I set it up each Sunday for congregational recitation of the refrain in rhythm, then cantors sing the verses to a Meinrad psalm tone harmonized. We use an older Grail translation because the monks have that in their souls from the daily Liturgy of the Hours.
Hereis how we’re doing the Alleluia these days. I grab the melody from Gregor and Taube because it’s corrected there against the earliest manuscripts. Then I add in episemata (did everyone catch the Greek 3rd declension plural there?) as indicated in the lineless neumes.
FWIW, here is our leaflet for this coming Sunday.