Ever since people figured out that the Raspberry Pi 4 has a PCIe bus, the race was on ... using a bridge PCB that replaces the VL805 USB 3 controller IC. This was also how the original ...

Overall Mini PCI-e is a fairly unloved interface, but we’ve seen the reverse of this hack before, a Mini PCI-e to USB adapter used to add a 12-axis sensor to a laptop.