I'm preparing music for the "extended form" of the Vigil of Pentecost. This liturgy is a little like the Easter Vigil: there are several OT readings (four, instead of six at EV), followed by the Gloria and then Epistle and Gospel (after which, unlike the EV, Mass proceeds as usual).

The current Roman Missal (2011) indicates that the OT readings are to be followed by psalms (and then priestly orations):

— the first reading (On Babel: Gn 11: 1-9) and the Psalm (33 [32]: 10-11, 12-13, 14-15; R. v. 12b)
— the second reading (On God’s Descent on Mount Sinai: Ex 19: 3-8, 16-20b) and the canticle (Dn 3: 52, 53, 54, 55, 56; R. v. 52b) or the Psalm (19 [18]: 8, 9, 10, 11; R. Jn 6: 68c)
— the third reading (On the dry bones and God’s spirit: Ez 37: 1-14) and the Psalm (107 [106]: 2-3, 4-5, 6-7, 8-9; R. v. 1 or Alleluia)
— the fourth reading (On the outpouring of the Spirit: Joel 3: 1-5) and the Psalm (104 [103]: 1-2a, 24, 35c, 27-28, 29bc-30; R. v. 30 or Alleluia)

My question is whether there are canticles that could be used instead of the psalms, in the manner of the Easter Vigil (see this discussion). I've used the canticles at the Easter Vigil for many years, and I've been asked to do the same thing at the Pentecost Vigil this year — so I'm trying to ascertain whether it's possible.

It appears that this liturgy has been tinkered with a lot of late:
— in the 1952 Liber Usualis, there were six OT readings (just as the Easter Vigil). Chanted tracts were to follow the second, third, and fourth readings (but not the first, fifth, or sixth), and these readings don't correspond to the currently indicated OT readings (except for the "dry bones" reading, which, alas, had no ensuing tract).
— in the 1962 Liber Usualis, which calls this a "privileged vigil," there are no OT readings at all, but rather the standard Paschaltide structure of a reading from Acts followed by two chants (an Alleluia and then a Tract) and then the Gospel.
— in the 1974 Graduale Romanum, two Alleluia chants are given, and no indications of extra readings, so the liturgy appears as a regular Sunday Mass. Unlike the Easter Vigil, no canticles/responsories are provided.
— in the 1990 Gregorian Missal, the four OT readings are indicated as options to be placed as the First Reading (that is, use any one of the four), and then (as would be expected) the same chants as the '74 GR.
— the 2011 Roman Missal, as indicated above (also the USCCB website), gives four OT readings, each to be followed by a psalm, and one where a canticle may be used in place of the psalm.

The canticle of Daniel, currently indicated to follow the second OT reading, is earlier given as the Hymn to follow Lesson V of Saturday in Ember Week of Advent, pp. 348-50 of the '52 & '62 editions of the Liber Usualis.

Any thoughts about other canticles?