There's just a few problems with this.

1. It would make the current expert dungeons very hard to queue for later on, since no one would queue for them individually that often.

2. The expert dungeons are designed to be equal in length and difficulty. Balancing dungeons would be difficult, especially since most of the dungeons you're suggesting to pull from are being up tuned.


3. Queues may be longer since you couldn't queue for these individually since they'd be unique tuned dungeons that are only available for the week