Once you have paid back the endorsement you are free to move to another type as an FO (or Capt) at no cost to you. .
No that is not correct there is no lateral movement as such. Your first move is as a Captain however that has been waived lately with all the changes going on.
So hang on here...are you guys saying that you can't move from FO E-jet to FO 737? It must be getting promoted to a captain first?