I think having Unreal dungeons as an alternative to unreal extreme trials for faux leaves would be a great idea. This Faux Hollows thing seems to be something SE wants everyone to be able to participate in and enjoy, like Wondrous Tales, but being Extreme level difficulty really narrows down the number of people who will do it. Giving a slightly easier, but much slower, way to grind out leaves via Unreal Dungeons would be a nice idea I think. And seeing as the current Faux Hollow from Shiva already has an insultingly low payout of leaves, they should up the amount of leaves you get from the extreme trials and make the current payouts be for Unreal Dungeons.

The dungeons don't need to have super scaled up mechanics or savage-tier dps checks, either. That's going too far. Just have them be tuned to mininum ilevel sync and make it so failing mechanics actually matters and it is fine. I'd say 24-man levels of mechanical failure forgiveness and overall difficulty would be ok. Failing mechanics gives you vuln stacks, with "signature" mechanics being oneshots if you eat them to the face. Too many dungeons just have no danger to them at all, with no punishment for failing a mechanic other than a laughable amount of damage that is easily healed back.