I have a farbwerk, not the 360, but I believe the function is similar, so this is what I did.
I keep all my aquacomputer devices with a USB port tied to a USB connection, generally using a USB hub.
I do this so I don't have to dig into the bowels if a firmware update is required in the future.
This allows me to assign a software sensor on my farbwerk from a temp sensor on my QUADRO, which would address your problem (see clip below).
As for costs, your cheapest option actually is to buy the farbwerk 360 direct from aquacomputer with the 5 EUR envelope shipping option, if you have the time, and if you can source the required
Pico Blade cables locally in Australia. If you buy the farbwerk 360 and 6 or 7 cables from aquacomputer in one purchase, you will probably be over the envelope limits.