This could be a new market. Presently, there's no motorsport rated bike helmet. You can buy a motorcycle helmet, but it's a heavy, cumbersome beast. Or a bike helmet that comes with virtually no useful rating system except for the Virginia Tech rating program.
Freeride/Enduro/Downhill helmets exist (https://mountainbikeguys.com/downhill-helmet/) but nobody has come up with a rating yet afaik. I own one, and it probably saved my life at least once, but can understand how nobody wants to wear one outside a downhill bike park.
NTA 8776 spec-rated helmets are built to withstand more forces than “regular” bike helmets. IIRC they are required in certain EU countries when riding an S-Pedelec (45 km/h limit pedal assist e-bike)
