Very thorough! While I will concede your facts, these are/were all fitness or outlier organizations and certainly not the standard for NPC bodybuilder contests and Ms. Olympia. After things started going odd in the 1990's with fitness contests to challenge the bodybuilder contests, those in charge were more interested in beauty contests than real bodybuilder contests and made them wear heels. No Ms. Olympia has ever had heels, but now they likely have a Ms. Olympia fitness that does. So while there are exceptions and a lot of new organizations coming and going I suppose heals will still be around, but not for the vast majority of contests in bodybuilder's long gone hey-day.
But hey, if that's the way you want to draw your bodybuilders, go for it man! Your art is great.