I don't see that this course is safer. The spin boats will be coming to the finish very "hot". Probably traped out under spin. Imo, the spin boats need to finish to weather, not on a reach.

What if both "B" marks were in close proximity, and constituted a gate for the yellow course? You would have very high closing speeds for both fleets, but you would also have the greatest visibilty for both fleets. Then if the orange "C" was directly downwind of "B" and orange finish was through the original start line you would maintain good separation of the fleets and optimal visibility.