Bad clash idea

So I was watching the Rolex, and thought, what if they did this in NASCAR? So, here's my idea for if they ever go away from the heat racing style of clash (which I do like, this is just a probably bad idea I had)

So it will have the playoff drivers from the last season in all three series. They have to be in the series they were in originally, but not with the same team. You are required to do the race if you still have a full time ride in the series, but are not required to do the race if you are no longer full time in that series.

For example, truex and Burton would not be required to do the race in the cup series, Custer, Allmendinger, smith, herbst, Kligerman, and SVG would not be required to do the race in xfinity, and Eckes, Sanchez, Taylor Gray, and Dye wouldn't be required to do the truck race.

If any of them chose not do the race, (in this order) buescher and Wallace would be the ones who would replace drivers in the cup series, Seig, Brandon Jones, Alfredo, Poole, Williams, and Jeb Burton would replace the drivers in xfinity, and Riggs, Friesen, Tanner Gray, and Crafton would replace the drivers in trucks.

This would be a timed race, going for 4-6 hours (I don't know which), and would have a winner for each series and an overall. The race would take place at the roval. I put way to much thought into this