I'm afraid that conversion isn't known to us in any way. The fact that it does 'something' probably means they based the conversion kit on an existing piece of hardware. I might be able to have a look at it if somebody could provide me with the details of the conversion kit, so I you could manage we...
You can disable individual hardware in Fanaleds using the option under the hardware tab. This was you can combine software to drive different parts of your hardware setup.
Please provide your lastlog.txt in the settings folder of your Fanaleds installation. You can open the directory in Fanaleds with File -> Open Settings folder.
There is an option to disable Fanatec hardware, but I suppose that only disables Fanatec hardware and not Logitech. I'm afraid you are in the hands of Kunos for this one.