Hello!
While it is not possible to get access to the Deepling boss teleport twice, you can farm as many crates as you want (it'll be even helpful to achieve the stage 3 of Liquid Black Quest faster).
One trick that may be helpful it's that even though you can't enter the teleport twice, you can stay inside the room after killing the boss and wait for its respawn. You are allowed to stay on the room for 20 minutes, and a normal resp occurs after 5~10 minutes. So it is possible to kill 2 to 4 bosses without leaving the teleport if your team is strong enough