Thanks! Knowing that what I might be searching for would be somewhere under the dashboard is a good first step.

Then I am not an engineer nor have any experience in electronics BUT I know from my dad that taking the dashboard apart is not an easy task. If I would succeed I do not know what I would be looking for… Would tan antenna look like a piece of wire? Or could it be embedded in the 'copper' circuitry of a PCB? Do cars use regular SIM cards like the ones found in phones or would they look different?

The maintenance manual would probably be a good place to start before trying to put anything apart.

Yup: write down the password when you set up the software and feed it to your "own" RustDesk on your computer.
Although I recently had a case where the password on the remote machine seemed to have changed by its own, but it could be me or the machine owner who did something funny without noticing.

Hurrah!
Let's see if this will be the update that will break everything and force me into a reinstall of LMDE… I wish I knew more about Linux, m re-installation rate is far too hi.

Time for an update! I hope it will be released with XFCE soon too.