Some say "...while we-all sup sorrow with the poor.". with the two words made into almost a single word with emphasis on the 2nd syllable.

Others very carefully say "...while WE all sup sorrow..."..

I normally sing two distinct words "we all" but with the emphasis on "all". I tried singing with the emphasis on "we", and while it works perfectly well, I prefer it my way

In fact, I believe that the phrasing of other verses support the emphasis on "all"

"There are frail forms waiting at the door" ~ "while we all sup sorrow with the poor"
"With a worn heart who's better days are o'er"

What puzzles me is:
It not only affects the phrasing, it also changes the essential point of the line a bit

I don't see that affects the point of the line in any way.

DC