Thank you Jean. Your best guesses are of great value. As I told you in my message it's such a thrill to talk with you here. It's interesting that you hadn't heard the chorus.

Makes me wonder if we are looking some parallel songs that have met along the way. I mean rather than just a collection of floaters. If that's so, we still may be able to find a more complete version of the one Hildebrand learned. Hildebrand has had this chorus and one verse in his head for 46 years and it's become rather like the Lost Chord for him. These other verses don't fit with them comfortably. (Speaking as singers, here) "...Maybe when Death's Bright Angel...."
Still searching. Cheers, Joy