Just for fun, what about a tweak where one alt per player can opt into a biweekly Battle Royale in Purgatorio. Show up with whatever loadout you want, but you can't leave until you die or it hits the end of the two weeks.
Winner is whichever survivor has most kills, with various tiebreaks (e.g. most levels killed, most ranks killed, most damage dealt).
Stats publicly accessible or announced to all a la Carousel station. Radios can be tuned to announce nightly kills for those who like tracking.
Winners listed on a page on this website. Winners listed also by what classes they've won with, to encourage build diversity.