With the prevalence of USB devices, it might be easy to mix up USB headers and ports, but there is a key difference between ...

I'm having an astounding amount of trouble with front USB on a new Aorus Master z590 build. I bought a 3.5" 4-port USB front hub which connects via a 19-pin connector, and also has a power connection.

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 ...