Hi you are a brave man considering the year of your car which is definitely fitted with the SFD+ protection system, this was fitted to stop people from doing this type of thing the only chance you have of doing this is to run in new fused feeds to each item from the battery terminals, any tampering with the main loom will cause the circuit protection system to kick in and close the can gateway down because it thinks its being stolen, very expensive trip to the dealers and not a warranty covered item, I also have OBDEleven and the only one click options that work are on pre 2019 cars after that it says its done it, takes the credits and nothing happens, example trying to reset the service/inspection intervals after service on OBD it took twenty credits for two tries and nothing happened, go again on the latest VCDS it tells you to open the bonnet to disable the SFD for this function press SRI rest twenty seconds later its done with no credits plus any other in depth adjustments it gives you the security code to access the thing you want like injector coding etc.
Steve.