Global automakers typically make small modifications to vehicles for different markets. Cars, like most engineered products, are built to a list of design criteria. BYD, like every large automaker that does this, has capable engineers that can target any regulatory specification you give them. They already do it for all of the other markets they sell in, just as every global automaker does.

Chinese cars don't exist in the US because of laws specifically designed to prevent their sale here. The tariff for Chinese EVs was increased to 100% a couple of years ago when it was rumored that BYD was going to move to the US market. And currently, there is a bill circulating to ban them entirely.