I see no fun or even benefit in doing that and I doubt cmp, who would have to do the work in WSE if it is possible at all, does. Lefties went straight to hell anyway back in the days.
The only one I remember suggesting to train both arms equally was Musashi in the Japan of the 17th century and it was mostly a philosophical thing. Have no preferences(so no strong/weak arm in personal combat, no prefered troop type on the battlefield as a commander), so you have no weaknesses, etc.