I had heard this before, but I don't know if I heard it from a source other than a Takeover quote.
"Takeover?" Don't tell me -- overzealous spellcheck for "Takei"?
I had also heard the Pan Asian idea and that us why Sulu used a foil in Naked Time as oppossed to a more traditional Japanese sword.
No, he used a foil because he imagined himself to be D'Artagnan from The Three Musketeers
. There's nothing pan-Asian about France. That was about writing him as an individual rather than defining everything about him in terms of his race. (Although "Shore Leave" fell back into race-based characterization by having him imagine a samurai.)