Almost gave up and got this back, I found paspro/rtl8812au on github (just search for it) with working drivers for kernel 4.13! Presumably this driver works up to kernel 4.15. The instructions are very simple. It appears to be running at full speed on 5GHz 802.11n. I'm just browsing my living room, so I can't speak much within range. Please note that during installation you may need to remove the version number from the folder as the installation script is looking for rtl8812au. So extract the zip file and change rtl8812au-5.1.5 to rtl8812au before running the dkms installer script. lsusb lists this device as "0bda:a811 Realtek Semiconductor Corp". means that any driver for that chipset should recognize the common ID and work.
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