why not have the gt special saloons in a 3 race Yesteryear of ireland series and make it ONLY for Paddy cars or a replica of the car if it does not exist or say a davrain imp that is NOT yr original example running in the livery of the original ie Vivan Candy capt america car
if u took 3 events say the 40th mondello aniversary phoenix park and leinster cup event type meetings as the dates it allows folk to see the old cars run maybe 3 6 lappers so its not boring to watch 6 cars tootle around and 1 mad irishman with more money than sense have the fastest car lapping the field
im sure if u start it slowly it can grow from 6 cars to 16
then u can make the championship in 1-2 years or mix them with the historics if they will have them
the biggest problem is the cost of rebuilding an old race car to run again can be higher than the cars value or race worthiness value if you know what i mean for sure to be sure