Do you have any pictures of the “track” surface area?
What’s been said about rubber tires fixing the groove is what you should do first. I think the rubber smoothens out the asphalt and coats it with rubber too.
A high visibility racing location is a big draw to the sport, if you use the tire-dragging method and it gets the track smooth enough to race rubber tire “Rally” cars like the Kyosho IGT, your gold
You can attract tons of new people to help pay for the new asphalt later on.
Where is the track going to be, USA?