Dear Knute,
Here is the best that I could do...but I'm not sure that this is the
most correct solution or that it will look good in context...
This solution looks the closest to what most of the editions I'm looking at do. None of them use the split-stem distributed notes. Thank you for working it out for me.
%%% BEGIN %%%
[solution snipped]
Yes, that looks good, thanks. It's weird, though, since this is a not uncommon thing that LilyPond has so much trouble with it. I'm not sure what could be done, maybe a "do not merge" option or even knowing that two notes with different accidentals shouldn't be merged. (I am a little surprised that d-natural and d-sharp get merged.)