Well, at first glance at least it appears the Cudy X6 might be able to accept a USB port add-on.
03/31 UPDATE: cough… these are the… cough cough… serial port… cough cough…
These are the pins I believe for USB and USB3.0 appears to be supported!
I am going to do some digging, but… I believe soldering a USB port to these four terminals plus some added drivers installed… I might be able to add a USB port to the Cudy X6 running Openwrt!
If you think I am on to something and this will work, contact me and let me know. Any tips you have would be appreciated, I am hoping for USB 3.0 speed and such from these terminals!
update: I found this link with some good images of the main board!