nice!!
I also have ordered my 2.5G switch (TL-SH1005) from Taobao.
Did you need to install any driver for the openwrt router to detect the ugreen adapter?
I am running OP under ESXI. I installed the USB (Realtek) driver under ESXI, and created a VMNetwork interface before adding it into the OP virtual machine. If you are having similar setup, do remember to choose VMXNet 3 for adapter type.
For ESXI USB Network drivers, u can find them here https://flings.vmware.com/usb-network-native-driver-for-esxi#requirements
If you are running native OP, just check if the OP image contains those USB 2.5G (Realtek) drivers.