The potassium bromide replacement is the PVP, right? It seems like other antifoggants could be tried---for that matter, is it obvious that one couldn't dissolve KBr in something else like glycerin first? But one would need to do *something* for fog control, certainly.
You clarified this below, but I still think it's an amusing way of putting it. Point taken about the development results---by design they aren't *very* different---but personally I quite like working with a concentrate that lasts forever rather than having more stock solutions to worry about.As pointed out there is a homebrew replacement for HC-110. It is called D-76.