They are available, I'm pretty sure.
If you check this chart it will give you the heights. (the 30L is 49.4, the 40L is 49.7mm high)
Rod Guilds Height Chart
What you really want, though, is a higher 25/20 and 12......so you can build a lighter rod that casts better. Those are supposedly coming as well.
Just a guess, but based on my experience with low riders I suspect a standard surf set up will eventually be a KW 25H-16-12-10runners layout angled down to a choke point about 1/3 the way in from what gets used now by NGC formula layouts.