Bamar changed their design from the belt driven model that you have to a gear driven design. There was a falling-out between Amel and Bamar over the failures of the model you have, so Amel to Bamar may not be the best route. Maybe someone who has done this can comment.
Look in the Files Section and you will find a letter from Bamar regarding an upgrade offer for Amel owners. That offer is expired, but I think they will honor it. Start with that in making decisions.