I'd settle for a Trebuchet emoji, because I'm fine with flinging billionaires across the landscape at high speeds.
Honestly, a lot more fun than a guillotine, imho. Think about the ragdolling as they tumble in the air.
EDIT: Also, the longer the hangtime, the longer they have to think about the decisions that led them to people wanting to fling their body a few miles with a trebuchet. No forced self reflection with a guillotine.
I’m imagining an event like the old school Punkin Chunkin, where people build elaborate devices to try and fling a pumpkin as far and as accurately as possible. Call it The Billionaire Fling and wherever the billionaires land is where they get buried.
Have amusement rides, bounce houses, fair food, etc, and donate all proceeds to food banks and homeless shelters.