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Just in case you missed it, the U3223QE does have one USB-C port for peripherals. See [0], bottom right of the image.

That's the USB-C upstream port for if you connect PC-2 via HDMI and PC-1 is connected to the USB-C display port.

I meant further to the bottom-right. Here: https://imgur.com/00KDqpq

thanks! I had no idea that one was even there. That sorts out my headphones!