Welcome to the forum. I've never heard of a .204 with a twist tighter than 1:12 that wasn't a custom build but rest assured I'll be monitoring this thread to see if anyone can find one. Great question .................
Yes, there is a faster-twist .204 out there. For <$500, too. TC Ventures (allegedly) come with a 1:10, according to their site. There seems to be some controversy if it really is, but it wouldn't be hard to check one at the dealer before purchase.