Q: How can I tweak Settings/Location to switch on/off the GPS receiver directly, independent if an app asks for position data or not?

Not sure about switching off, but for updating location in the background, gpscon can be used:

/usr/bin/gpscon --script --fout --posm=all limit=250 interval=5000 tout=60

https://openrepos.net/content/halftux/gpscon

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