I like the idea of naming trophies after players though this is normally reserved for individual player awards so may seem a bit strange - but competitions should not be SL prem etc as the sport is not super league it's rugby league. You can't have the rugby league super league premiership.
At the end of each season I would have:
Super League Play-Offs - Super League Champions
Super League Fringe Play-Offs - Super League Fringe Champions (2nd
and Rugby League Premiership Play-Offs - Winners (3rd
Then you can rename the other divisions below that accordingly.