If it helps at all, I just got back from my first HPDE. Not just first in this car, but first ever.
I was in the same boat as you and wanted to find the best suitable combo for my first time out on the track and ultimately decided to go completely stock for everything. Realizing that I am not in the position experience and performance wise myself to justify buying performance parts to "upgrade" the track readiness of my car. My inconsistencies in driving line, steering input, throttle etc would far outweigh the second a lap I may have gained by doing some wheels/tires beforehand with my experience level, and wouldn't make the experience any more/less fun and engaging.
All of that being said, I had SOOO much fun out on the track!!! The car handles excellent and has phenomenal feedback even on the stock tires. It lets you know when you're pushing too hard, when it starts to lose some traction (all traction/stability control still on of course), and when you get in a solid lap and proper lines, the car lets you know and you can be proud.
Spend the money you're saving right now on track time with instructors who know how to handle lighter cars and the lines they drive with them, buy an extra set of stock wheels/tires if you're scared of using the tires all up on the track if you're going often. Learn on these tires and then upgrade as your skills improve, at least thats what i'm doing!
All I can say is that I'm definitely addicted and can't wait to get back out there!!
Hope this kind of helps. lol