I finally have a few seconds to write this up. The attached file to this post is the source code for the Alfa AC1200 (RTL8812AU)
Simply extract the files, modify the Makefile so that CONFIG_POWER_SAVING = n (ctrl+f all the things)
Then type make
Wait for a few minutes for it to finish.
This should work for any kernel version >4.0. I have not tested it with anything older.