MBP 14,1 (13" 2017 two TB ports)
At work I have a Dell USB-C dock that my external keyboard connects to - display is connected differently. There, like everywhere else I've seen this, when I connect an external (normal PC) keyboard it asks me to identify it ("press the key next to shift") and after that I can configure the external keyboard separately from the internal one (I like to switch alt+cmd on the PC layout).
I have a new LG screen (27UK850-W) at home that connects to the MBP via USB-C. It charges the device and transports display on that connection. The screen also has two USB-A ports - they work (I connect a mouse and my default external keyboard), but the keyboard doesn't show up as a "separate" device - if I remap the keys (alt+cmd in my case) this is also done for the built-in keyboard.
Any ideas how I can work around this?