Actually, the studio approached him before the film was even finished. Oshii says he has "nothing against the idea," and would hope to see the Japanese actresses cast in the film, though he notes that "Hollywood has the tendency to remake things left and right these days." (For clarification, these quotes are attributed to Twitch, who is paraphrasing Oshii-- or the Japanese article that might also be paraphrasing him.)
Here's the trailer for the (original) flick. What do you think? Would you go see it? And who do you think Hollywood would want to cast in it?