Hello,
8188EU is supported and distributed in OSMC. We use the in-tree module for this as it is quite mature and stable. My guess would be you have a dongle which the driver isn’t yet aware of (VID/PID). If you get me the output of lsusb, I can add it to our driver.
Our kernel is a moving target, and I have just rebased Pi to 4.4. Your compiled module will only match the kernel it was built for (this is by design to prevent issues).
Sam