One idea could be to implement a test, like an augmented Hall of the Novice. Then if you complete this test, you can tick a checkbox in your DF that only queues you with others who have completed the test. Nothing overly complex or elite, just basic competency for regular content.

If you want a shorter queue, don't mind carrying others, want to help mentor players or the first time bonus is an incentive then you don't tick the box. This also means those who pay subs or struggle due to disabilities aren't locked out of content.