Personally I'd go for option 2 with a relay but the current draw of the relay itself may trigger the power to be cut so then you'd be left with a manual switch.
I'm presuming by manual switch you'd considered the old fashioned door pin type that they used to use for courtesy light switches?
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V60 Cross Country D4 (2.4 5 cylinder) AWD Lux Nav Geartronic 2016 - Electric Silver, Polestar Optimisation and Police Spec Dipstick
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