Now that the correct term is revealed, thanks to @Freigeist, I have found these two threads discussing the same: Fairphone 4 possibility for Dockingstation and Which usb-c dock for FairPhone4?. In the former, this model got mentioned in particular as something facilitating the use of an external mouse and keyboard at least: Dell WD22TB4 docking station. Maybe something simpler with a lower price tag?..
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