Stop and go penalty would be fair and equitable. But enforce it every time you leave the track. Across the board. Leave no room for interpretation of racing incident/mistake/cheating.
Make a penalty lane behind the mechanics area. Speed limit is 5 mph. With radar showing their speed. Have an official stop then for 3 seconds. Get popped speeding then you are held for 8 seconds. And continue on.
This creates drama for the fan that doesn’t actually ride. Could attract viewership.