You know you can create different car steps (there are several examples in the game already), where you keep the whole car but just make another folder with different files for suspension, tyres, wings, and can even have different visuals.
But I still don't understand where the game is lacking simulation value, the times you posted bits of how you want to make the car, other physics modders said you were doing it wrongly, with the wrong method.
So unless you can show what is wrong with the game physics, like other physics modder have done in the past, and then the devs can correct it, all your statements about the game have no value really. Be it for AC, rfactor, iracing, etc. the way you're saying something is wrong in the game wouldn't help any dev from any sim to identify that.
Is unwise to refuse any help on how to mod for AC because they already released several mods for AC and you none, therefore your experience is too low to say they are wrong and you're not, unless you can clearly show where the game, the devs, and all the other physics modders are mistaken. So far you haven't managed to do that, only talk on many pages, make a reader submission on that blog, but 0 (zero) issue report to the devs or other physics modders. One thing is to have all the data in the world and another is to correctly put it in the software. Before you say the game is bad and has no simulation make sure you're actually introducing all the data correctly for your own car, with your own data, without taking tyres and so on from other cars in the game.