I know these kind of people. I have these kind of friends.
Yes. Disconnect the speedometer. You won't know how
fast you’re going, or how far you've gone on a tank of
fuel. But your odometer will not move while you drive
the car. Old style vehicles had a mechanical cable. You
could unscrew it at the transmission or at the instrument
cluster. Newer style vehicles are electronic. So just disconnect
the instrument cluster Electrical connector. You might also
lose the temp gauge, fuel gauge and any warning lights though.
You'd have to be very careful doing this as on modern vehicles much of the instrument cluster is connected such that the vehicle won't start or run when it's disconnected. The electronics are too intertwined. It also doesn't necessarily mean that the odometer won't still add miles as the electronics tracking it could be in another module on the vehicle.