You could run a 19t spec class. don't run seperate heats for them but let them run with the other cars. so that you still feel part of the day. just have a different points board for them. leave everything else the same, that way they can use the same gear if they want to change class, just change motor.
and like dave said, limit it to f5-f4 drivers, and if they finish in the top 5 in the f5/f4 championship, they move up to the next grade, if they want.
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