Arguably it's easier than ever to get into the Binding Coil of Bahamut. Not through Duty Finder, but you can now go with the Undersized Party option to disable the level/item sync entirely. And with that, there's actually a huge amount of freedom open to you. Get a couple friends who've been through the content before and you'll be amazed how accessible things are, even if there's literally just four of you going in.