Thank you for the hint, I used AnyDesk (think it was built by people who worked at TV) but I'd enjoy an open source solution even more if it does what it should.

I've been using MeshCommander/MeshCentral (and their older tools like Open MDTK) since the first public versions, both for vPro/AMT related management tasks, and remote control. I'm very happy with them but I certainly won't rely on the assumption that they can't be hacked. With enough "motivation" an attacker has plenty of targets on the logistics chain where a vulnerability can be introduced (in the code, in the installer, etc.).

For a less sophisticated option for home users there's also DWService that is open source.