Not sure if there is any interest after trying several different repositories for RTL8812AU several months ago, but...
I found GitHub - fariouche/rtl8812AU: Realtek 8812AU USB WiFi driver and I've successfully built and installed it for my 8821 based USB wifi device. I think the biggest issue with 5.2.9 before was that it only worked for 8812 and that caused a lot of LE/Milhouse users to have broken wifi.
I've been using the 5.2.9 driver for about a week now and haven't had any issues. This driver doesn't seem to support 8814, though I don't know if there are a lot of users with those devices.