Best part is it's $5000 because they get to name their price. These sensors, headlights, etc, cost nowhere near that, but where else are you gonna go get em?
So in a few years when your new car has depreciated to somewhere around 10k and you get a massive repair bill? Well most people are scrapping it and getting another car, convenient for them....
If everything extracted you should be able to add the main .exe from the game folder to Steam now as a non steam game and use Proton that way (or do similar via Bottles or Lutris if you prefer).
Tricky part sometimes depending on the game is getting the right exe. I like bottles since you can do the Run executable to install which auto adds the .exe to bottles at the end, I needed this for Boltgun since I was picking a way wrong exe.