It’s very easy to lose track of the sheer weight of Chinese automotive start-ups that are starting to make waves outside of their domestic markets. BYD is busy trying to out-gun Tesla pretty much everywhere, while Omoda, Leapmotor, Xpeng and Nio have found an audience with European buyers in recent months. Zeekr is among the latest of a long line and, with the full backing of the Geely Group behind it (owners of Polestar, Volvo and Lotus), introduces another potential thorn in Elon Musk’s side. Scratch that, every automaker’s side. The Zeekr 7X has arrived to challenge the ultra-competitive, mid-sized…