Are the starting handle dogs incorporated into the pulley on the Bovington example? It's hard to be sure.
In any case, I feel that having them as a separate part, in steel, is probably a better idea.
They are actually a bit of a game to machine, as ideally the included angle < 90 degrees between the drive flank and the ramp. I have a setup that can do it, if you want to decline the challenge 😉