the only tweak they probably have to make is just to print existing dials upside down, so as to accomodate the dial feet positions when the movement is flipped.
everything else remains the same
winding should still be the same if u have the crown on the right side.
as date wheel is in a circle, it always reads the right way up on the right side also...
now if the date was on the left side, then there would be obvious need for a new date wheel.