You should be able to just put wifi USB dongle into the USB-C port. These things can be small. Though there are no USB type-c wifi dongles apparently (now that

You should be able to just put wifi USB dongle into the USB-C port. These things can be small. Though there are no USB type-c wifi dongles apparently (now that I'm searching the web for them), so you'd need an otg adapter too, and there goes the size benefit.