Seems like replacing both leading edges is a little extreme, you can just splice a new piece extending out from the break. I have spliced leading edges and spars, put a piece of sheet behind or below the splice to reinforce and it works fine. As for finding a matched shape you can just use balsa stock that is bigger than the original leading edge, splice it on and then shape it to the original. Im not sure how extreme the damage is but for a trainer just splicing pieces in should do fine, just do a little reinforcing around them.