Do it like I did years ago. I bought an extra set of steel rims and mounted some MT 26 x 8.5 on them. I bought the rims for about $12.00 each at a local tire outlet. I also got one of those mini jacks. One tire in the back seat, one in the trunk with the mini jack. Drive to the track, swap tires and race. And reverse the process at the end of the day. It was pretty much a daily driver..here is a picture of how it looked back then.
I had to sell the car to start my next project.
Ron