I would like to suggest making dungeon tokens tradable (not account bound). To make it so that acquisition of dungeon gear still represents completion of the specific dungeon, the player should only be able to talk with the dungeon vendor if they have completed the achievement that is gained for finishing all of the paths for that dungeon.
If a group of friends each wants different dungeon gear, it is currently much more efficient for them to split up and PUG the dungeons rather than play together. With this change, the friends don’t need to split up to get their gear in a reasonable amount of time. It would also be easier to get friends to join a dungeon run because the tokens would no longer be useless if they didn’t want that dungeon gear.