Modify Home Wizard P1 integration

This is my first post here so please bare with me.
Returning to Home Assistant after a few years and boy have things changed…

I have installed the Home Wizard integration to make use of our P1 meter. On its own this work perfectly so far. The issue I’m having is that there is an attenuator before the energy meter the P1 is connected to. The attenuation is 150/5, so a factor of 30 (150A is attenuated to 5A).
So to get correct values, I think I need to multiply all readings by 30. And the way to go to me looks to edit the sensors.py file for the integration here core/homeassistant/components/homewizard/sensor.py at 9e388f5b1335bda9daff25b188483a3b991339a1 · home-assistant/core · GitHub
I have enabled the samba and terminal & ssh integrations to be able to access the file system but I can’t find a trace of any Home Wizard files, let alone the sensors.py file.

Is there any way to accomplish this?