According to Apple's product page on the new 2017 MacBook, it's capable to drive a 4K Display with 60 Hz. However, USB-C Hubs limits the output to 4K@30Hz. Is there any adapter out there that leads the DisplayPort's signal through and allows to plug in a USB-C cable just for charging the MacBook? The LG UltraFine Display does that internally. But I'm looking for an adapter to be more flexible.