I second this idea, you can't choose your weapons in this gamemode, it's all random so it's a 50-50 chance whether you'll die or live and the beacon fight club map is perfect for it. It combines your luck and skill and lets you train with different weapon styles - a breath of fresh air to constant 2v2 4v4 premade squad missions and best of all there is no threat there is no need for some intense team-collaboration, it's a good old free-for-all mode which you can enjoy playing solo.
And to those who are cherry picking on how it's called '12 death of christmas' we could always just change the name up and make it a third branch for fight-club.