I've also taught people with no musical background to sing the chant from 4-line notation. That's even easier: "let's sing the scale; look, the funny-looking C marks Do, mind the half-steps, here we go."
I’ve never seen this, and I would go with the same approach as for the collects with the caveat that the dialogue should be comfortable but not so low as to oppress the congregation, which can always sing below. It really can’t sing above a bass. And only rarely would I ever make a priest change the incipit of a Gloria from the key used with the chant to better match a polyphonic Mass…it’s too risky.Of course in reality, the pitch of the preface changes depending on the Sanctus,
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