This device can currently be flashed to tasmota with Tuya-convert. The advice on blakadder.github.io/templates/qs-wifi_D01_dimmer.html was great and suggested compiling tasmota with scripting and setting up the following script to get the dimming working

gist.github.com/thxthx0/c22555f6ec25c3367264729a0ff74dce#file-wifi-dimmer-script-txt

Once the device is all setup correctly a command can be issued via the Tasmota console to make it appear in Home Assistant, Enables MQTT discovery:

SetOption19 1

Light brightness can now be fully controlled