I'm left handed but when swinging from in front use my left hand, stepping away as my hand comes down, seems to be the most natural action. When propping a Gipsy or similar using my left hand.
On floats the swinging from behind is the only possible method but with a lot of aircraft there is no room to do it. Its easy with the Cub and A65s usually start well so that is the method I would use in your case.