I love car seats, their designs, and evolution of car seats styles and designs over the past 3 decades. So out of curiosity, could a person in the US install/use a British or Swedish car seat ? Bc I've seen the celebrities do it via Instagram (North West is in a Britax King without the chest clip, and a few other celeb babies are in Britax Kings). Could one order a Klippan Triofix (Sweden) and use that to the RF limits in a U.S. Vehicle?