Can it be an american category one day in the future? maybe/possibilities?

To echo my sentiments from the other thread, I think it would be as interesting as a speedrun of any old football game or another sport with a fixed clock. I love me my sports games, but that does not sound interesting to me at all. Progress in the Japanese version is not tied directly to running out the clock as fast as possible; that's why that version is even remotely interesting to speedrun.

You are welcome to post a run here of what you're proposing, though I suspect it will be little more than finding creative ways to waste time, which goes against what I think of as a speedrun.