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Just rewire the pins and build your own jig that reverses it (or undo rewiring as needed).

Might be able to short the right data pins from behind to ground and rip that out as needed. Or a hidden switch that does that.

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Rewiring the pins doesn't necessarily do much these days as there are devices which will figure out the input pinout and route signals to the proper output pins. Think of it as a MITM device.

A better way is to use a different kind of connector but you'll have to build yourself an adapter and to keep in your place or something.

Remember to put a standard-looking dummy ODB2 port where the original was, so any would-be thief has a convenient place to plug in their dongle.

I’m reluctant to mess with the wiring on a brand new vehicle; a lock would make me much happier.

Also reversing pins would be something that is very easy to forget - you end up shooting yourself in the foot!

Couple of vampire taps bridging together the right data lines to ground can be easily removed without too much evidence.

I understand a lock, but just have a hard time seeing how it would actually lock (well), especially as a universal device.

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