Within the Divine Office, one sees the lessening use of the Gloria Patri as we progress through Passiontide and Holy Week. By Maundy Thursday I believe they disappear altogether.
I was substituting the Gloria Patri with another old liturgical acclamation, but I do recall the saying of Christus obediens.
Thanks for mentioning that Trento.

I will use that for the rest of these days until Easter.
Practice here for the Rosary is saying only Joyful or Sorrowful mysteries in Lent up until Passiontide starts, then it is Sorrowful until Easter.