I’ve always wanted to have internal usb ports and ideally dual ports (for a trackball mouse and spacemouse) but it’s going to be super tricky
There might be room to add a nano hub (like this, Muxtronics NanoHub)

Thought I’d play around with one of these because I have a few of them. I knew it wouldn’t fit but I was curious what they looked like inside.
It’s a little hard to see through the epoxy potting but the usb-c and usb-a are fairly close with very little pcb between them.