it is simple to do such... with your character level, put ILEVEL restriction on Alliance Roulette based out from the level on the job you queu in for if you are level 60 and want to use it for XP then to be able to queu in you need the minimum ilevel for Dun Scaith... you can do that easy and the system of ilevel locks is in the game already and these are very much working as intended.

Simple as that... then you cant just drop all your gear but weapon and queu in alliance roulette, but would need to queu in at the minimum ilevel for your tiers max level 24 man raid at at least the minimum ilevel.

And nope, don't come at and say it would be too difficult all the gear needed can be bought for poetic tomes in which is the general gear currency for below level 90 gear.