Throw awat the iLv system, implement a PvE Rank system.

[Ninix]

locks out a large group of players

Are you kidding?

The ilvl requirements are all laughably low. I could wear my valentines costume and still queue for most of them.

If you're talking about the party finder, just equip some i90 rings from another class until you're past whatever arbitrary minimum they set, and swap back once you've joined. I do it all the time. As long as you play as well as you say you do, they will be none the wiser.