Thanks. I went ahead and bought the panel you linked to on aliexpress for the USB C. It also had a barrel power input, but the text says also USB C power interface. Hope that it's the right one.

I was thinking since my motherboard B550M Mortar has only one USB C header and the Hyte has a USB C front panel I would use this:

PCI-E Card

and

USB Type E to Type C cable

I too would prefer a flat cable. Still looking.