just add one end game reward kiosk that includes all raid gear/PoE gear/trials/banner. or they could do like the dusty engrams that slideitin sells for old banner gear. have the vanguard sell dusty engrams of vault gear, eris sells dusty engrams of crota gear, variks sells dusty engrams of prison gear, vance sells dusty trials engrams. but maybe you can only get gear you have previously received as a reward from these engrams, that way you still have to play the raids, etc to get them.