Unfortunately, the EM919x is wired in a way which makes it incompatible with any devices designed for e.g. the EM7455 by default (IMHO quite stupid design decision).
If you are capable (or know someone who is) of soldering, it is fairly trivial to modify any USB-m.2 adapter board to pull the PCIe_DIS signal to 1.8V, so USB is activated instead. Create a resistive voltage divider between 3V3 and GND (e.g. 10k to GND and 6.8k to 3V3), and connect it with the PCIe_DIS pin.