I think it got mentioned in the april fools thread, but I do think this would be worth some consideration. It would be like headshot wars, except everything is opposite. We could call it Boomtime or something like that.
Fun rounds are designed to be chaotic at all points. Hidden, Reaper, Harpoon, they're all just a hilarious shitshow. I think the DB would have to be nerfed for it to be a fun round though.