i would say that the knurl you have pictured was done by a custom knurl wheel
#1 i would ask for a quote for a custom knurl
#2 (if you have to because you would have a problem generating a knurl that looked acceptable on a cnc lathe)
you could cut down the width of the knurl and generate the arc with the middle being comp'ed for the width you might get double knurling on either the start and finish or the middle of the part (because of the difference in dia.)