I wonder if SE wouldn't be able to programm something like a lobby or even a perk for FC Housing.

For the lobby you can be teleportet to a pre instance, where you are able to form a full Alliance group and ONLY there, while also provide a 2nd entrance to the dungeon. This would be seperated from the open World and won't interfer with the limited 8 man groups.

This is not to prevent the DF queue (from anywhere in the World) for solo or small FC's that can't fill a full Alliance, but as addition for the bigger FC's.

For FC housing you would be able to form an Alliance inside the House and perhaps have something like a Portal reward that let's you choose from the 24man Dungeons.

Don't know if this would be possible to do in 3 weeks, but I would hope it would be faster than 2.2.