A race I would pay to see, Take a current grid of 20ish FF cars. Let the current drivers qualify them, grid em up. The take the current group of 20ish F1 drivers and fill the FF seats by lot starting with the poll car.
For a million bucks, winner takes all.
Standing start, full fuel load length, one load of fuel, one set of tires.
The question would be what track? Spa?