There was at least one other story - "A Certain Cursed Fighter," by some madao. Unfortunately, the author completely removed the story from both fanfiction.net and his blog, for whatever reason. I think I have all of the chapters (four) that were originally released.
I've created another test sketch, but don't have access to a good scanner, at the moment, so...
Well, I've had an odd idea (predates even the first sketch, above, but it's not related to the sketch) - what if Ranma discovers she's actually a Mikoto clone? And, ironically, Genma is NOT one of the people who have lied to her... but if not him, then who?