I've been thinking about this since I saw it yesterday, even contemplating tackling sucha project. My only reservation is whether a single harmonization per tone will always suffice, especially with regard to the termination formulae.
Take a look at Theodore Marier's psalter in the choir edition of Hymns, Psalms, and Spiritual Canticles. The first half of the verse is sung in unison (soprano) and the second half in four parts. It's wonderfully effective.
Many thanks, Aristotle and Charles. After Epiphany would be fine. The Klein Graduale will only appear in print in Spring 2014.
One of the complexities will be that the harmonisation of some psalm tones should also allow for omitting the final note of the mediant cadence in case a half verse ends with an oxytone (which occurs quite often in Dutch).
On another note: today Pope Francis was presented a CD which includes four recordings of antiphons taken from the Klein Graduale!
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