After considerable thought and experimentation, I came to the conclusion that I wanted to use memoir's
\changemarks facility to indicate, as a courtesy to a client, where my proposal had changed as a result of our discussions.
\changemarks and friends are suppressed unless the
draft class option is used. But using
draft gives me some horrible side-effects, like missing graphics and blobs at the edge of my occasional(!) overfull box, as well as being semantically untrue.
I thought, initially, about latexdiff (barfs on my files), changebars (appears not to support xelatex), and changes (conflicts with memoir), and discarded them for the reasons mentioned. Now I'm heavily invested in the native memoir solution, I'm not sure which way to jump.
Can anyone suggest a reasonable quick fix?