You could do USB header -> Hub -> Extensions and then expose each extension externally I suppose, but it would not be pretty. While it won't use your motherboard's USB-C header, there are PCIe header ...
The new Sonnet McFiver brings internal SSD storage, 10 Gigabit Ethernet, 10Gbps USB-C, and two SSD slots for high-speed storage in a single PCIe card for the Mac Pro or any Mac with an PCI-E enclosure ...
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