So essentially its just type-c(dock) to type-c(switch) which if that's what you're saying then it makes more sense to me than other methods i've seen online, I have seen few people running issues using usb-c+hdmi adapter with the switch which makes them not work anymore due to newer firmware.
Yes, it's just a simple £4 USB-C male-to-female extension cable.

. Paying duos is good fun too, and it has in game voice comms