At the beginning, I believed that the "projective flow" was a new function of "curve project, Isect, silhou"; I didn't see, the small option to check, after to have selected the surface of base.

As we can see on this screen view, the Frieze can to be projected same on all the small borders.
To do that, with a "Projective Flow" is not a easy thing, in this case.

With the same frieze, a base line (not a surface) + "Projective Flow (Straight)", to a target line (not a surface), we can get easily a nice crest on an helmet, like a mohican hairstyle (or some punks). MoI, it's fun!