I'd suggest what the CS:GO community does with case battles. But instead of case battles, it would be "Slot Royale" where someone creates this "Royale" by selecting a bonus buy from a slot of there choosing, the price of the buy, and how many players the "Royale" will include, example: (2-8). Everyone who joins would have to all buy in at the price of the bonus buy and whoever wins the most from their buy would win the "Royale" entirely.
Username: 2CheeksMcClapp