Actually the "style" is a great idea.
Personally, I want to edit the driver as well as the cars. I want to change their suits and helmets to match names. Then, we should be able to save a grid "style", which would include the cars, the liveries, the driver names, driver suits, and helmet styles. Basically, the same as the car styles. It would probably need to contain the setting sheet for each car as well. Then, share the race styles for others to download.
Like the way your personal liveries and downloaded styles are now
So you would only need one car, the rest would be part of the style. They never go to your garage. Maybe they could add a PP slider for you to play with as part of the difficulty. I'm finding the cars are really will balanced in the Sophy races when I use a specific PP target
I captured my 2025 F1 grid as an example - You, as a player, own one F3500 and style it as you wish. Then, you can download a race style, which would contain the rest of the cars (and liveries, driver names, etc).