The best way to get slicks is to buy take-offs from a smooth racer. The tires won’t be trashed and they’ll usually only be about $150 a set. Tire warmers aren’t actually necessary. They’re a convenience so you can go out and immediately have confidence in your tires. Otherwise you just need to take two laps easy in the corners so they can come up to temp. The difference between a cold slick and a hot one is absurd. At 160 degrees, a slick turns into soft, tacky gum that just glues itself to the road.
And yes, having tons of fun. Honestly, the way you’re riding in those videos, I think you’d have a blast trying it out for yourself. I have no doubt you’d prefer being on the open road for most of your miles, but testing yourself in a closed environment every now and then can be a lot of fun.