> I haven't seen anyone else using anything like it.

Isn't the point of adhering to a style so that others will already be familiar with it?

I have seen the kVariable style, and of course the iterator convention. I have never seen the other two, however; usually globals are denoted with all-caps and locals are just assumed (xVariable seems annoyingly superfluous). That's just my opinion, though — if I were coding in a language where your style was the most common, I would use that instead.