I think the Surf coaster is a misstep. Stand ups died off for a reason, and the ones already running have their lines die off quickly. I'm not sure they will take off again unless B&M found a way to make them significantly more comfortable.
EDIT: I finally saw the trains in pictures, the vest restraints should help, but bicycle seats + stand up + positive G's = mass discomfort. Also, I've had my fare share of bus rides where I was forced to ride standing up, and I will say that wasn't very ideal, so the thought of doing a launched stand up coaster sounds like a bad idea. High speeds and larger elements also contribute to higher positive G's which is what you don't want a lot of on a stand up. At parks with stand ups, I always ride them early as if I ride them later, my legs really don't like it after walking around a lot. The layout at Sea World has an inversion, a horseshoe, and several helices, curves and s-bends.
Also, all stand ups by default don't have the best capacity due to having to manually adjust each seat to each rider. I remember Mantis and Green Lantern at NJFTP having pretty slow dispatch times and constantly stacking all the trains and having 28-32 seats to adjust and check.