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Agreed but that is not an option. Bike are not allowed in the building.
A security team patrols this car park every few minutes (can't go into more details) and whilst possible, I think it is unlikely that a thief will get through two Abus Granite 54 locks without making noise that will draw attention to the security guards.
For this reason, I want to stick with my current double D-lock arrangements and make it a bit less likely that somebody can make off with my brake and seatpost before the period of n minutes has passed.
Keep one hand on your bike at all times.
If you make it so hard to remove the parts that it's easier to take the whole bike, that's what will happen.