Why not have some form of expansion draft? LG tries to model the real NHL/AHL/CHL to some degree. It reflects what's really happening in the NHL, and it could be a novel, fun event to kick off S28. Let teams protect a certain number of players, (and/or require them to expose at least one player under contract for S28, drafted or otherwise), and let Vegas have its draft. Maybe give Vegas some extra untradeable resigns too. Make an event of it.