I don't think there are many people here familiar with that particular boat / mast setup. Bach had a good suggestion and there are other possibilities too. You could try to step the mast from the front of the boat (boat on the ground), step it with the mast rotated 180 degrees (possible, but you have to pay close attention to the rigging to get it rigged properly), etc. Some masts have to be stepped rotated at 90 degrees (most Nacras)....there are all sorts of possibilities.