I recommend the change that we can stack keys. Right now we get 1 key from argents which opens dungeon, 3 dungeon completes a gold key for trial. however when done you have to then go back through and redo the argents, dungeons again. You can fill up the whole screen with keys but when you do a dungeon, the linked argents are again needing to be killed for keys. If you on the other hand, farm argents for keys, stacking them up with numbers next to the key for that argent, and same with the dungeons, then players can run dungeons over and over as long as they have needed keys in their stacks. I recommend a max of 10 keys per stack so this doesn't go overboard.
An example