I know the chart your referring too and is pretty much says the only good option is buying a track car and tow vehicle or stock safety gear. Stock safety is pretty much useless on a 400hp car and a long straight.
Just like your OEM safety equipment is a system of belts, bags, pre-tensioners, etc. Track safety equipment for HPDE is a system as well.
1. Helmet Few hundred dollars
2. Hans, Seat with harness holes, Harness bar, and 5+ point harness. Few thousand dollars
2A. Fire rated gloves to help exit, bottle extinguisher*, roll bar with SFI padding.**
3. Not legally streetable car. Why, because at this point your doing full cage, nets, and halo seats. Many tens of thousands of dollars.
#2 is what your looking for if you intend on using the harnesses.
* For use only if trapped inside, always exit the car ASAP if there is a fire, don't fiddle getting the tiny extinguisher.
** You can get more personal fire gear but with a full oem interior of fire resistant material it's not too necessary beside for looks. And you get into the argument of then why are you not installing a full fire suppression system.