From Kodak's website:"As pointed out there is a homebrew replacement for HC-110. It is called D-76."
Compared to D-76, HC-110 (dilution B) produces:
Slightly less shadow detail or true film speed;
Slightly finer grain;
Slightly lower acutance.
My point was that HC-110 was designed to reproduce the results of D-76. The conclusion is therefore that D-76 is a good homebrew replacement for HC-110. I wasn't trying to be sarcastic.
There is an interesting corollary in this and that is that there are no miraculous developers. No matter how strange the chemistry of HC-110 it still behaves like a well known conventional developer.