Welcome all,
Another delayed response...have been on holiday.
I think the easiest way to change the right and left brakes would be to switch the whole brake lever. Just remove the grips, slide off the brake lever and switch to the other side.
Or you could change just the cables but I think this would be difficult. They are hard to reach inside the tubes and are joined in some places with connector blocks. At least the front one was, made it quite hard to remove.
Post some info on how you did it if you are succesful! (We need to keep this forum alive somehow).